Honda Prelude Accord Civic S2000 2001-2006

TroubleCodes (24 of 29)

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2.4L L4 - Std



2.4L L4 - Std

Trouble Code: P0106

Manifold Air Pressure Sensor Range/Performance

Trouble Code Conditions: Engine started, engine runtime over 1 second, and the PCM detected the MAP sensor was more 11.8" Hg during the test period.

Possible Causes:



MAP sensor source vacuum line is leaking or disconnected
 
MAP sensor source vacuum line is plugged at intake manifold
 
MAP sensor is damaged, out-of-calibration or has failed
 
PCM has failed
 

Trouble Code: P0107

Manifold Air Pressure Sensor Circuit Low Input

Trouble Code Conditions: Engine started, engine running in closed loop, and the PCM detected the MAP sensor was near 0.0" Hg during the CCM test. Note: The key on, engine off MAP sensor input should be near 2.9v.

Possible Causes:



MAP sensor 5-volt power circuit open or shorted to ground
 
MAP Sensor signal circuit is shorted to ground
 
MAP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0108

Manifold Air Pressure Sensor Circuit High Input

Trouble Code Conditions: Engine started, engine running in closed loop, and the PCM detected the MAP sensor was near 29.9" Hg during the test period. Note: The key on, engine off MAP sensor input should be near 2.9v.

Possible Causes:



MAP sensor signal circuit is open, or the ground circuit is open
 
MAP sensor signal circuit shorted to 5v VREF or system power
 
MAP sensor is damaged (due to an open circuit) or has failed
 
PCM has failed
 

Trouble Code: P0111

Intake Air Temperature Sensor Range/Performance

Trouble Code Conditions: Engine started, engine runtime over 10 minutes, and the PCM detected the Intake Air Temperature (IAT) sensor signal changed too much in too short a period of time during the CCM test.

Possible Causes:



IAT sensor signal value less than 1.0v
 
IAT sensor ground circuit has high resistance
 
IAT sensor signal circuit has high resistance
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0112

Intake Air Temperature Sensor Circuit Low Input

Trouble Code Conditions: Key on or engine running, and the PCM detected the IAT sensor signal indicated less than 0.1v (Scan Tool reads over 302ºF).

Possible Causes:



IAT sensor signal shorted to chassis ground
 
IAT sensor signal shorted to sensor ground circuit
 
IAT sensor has an internal failure (it is shorted) or has failed
 
PCM has failed
 

Trouble Code: P0113

Intake Air Temperature Sensor Circuit High Input

Trouble Code Conditions: Key on or engine running, and the PCM detected the IAT sensor signal indicated more than 4.90 (Scan Tool reads less than -4ºF).

Possible Causes:



IAT sensor signal shorted to VREF or system power
 
IAT sensor signal circuit is open
 
IAT sensor ground circuit is open
 
Sensor has an internal failure (it is open)
 
PCM has failed
 

Trouble Code: P0116

Engine Coolant Temperature Sensor Range/Performance

Trouble Code Conditions: Engine running, and the PCM detected the Engine Coolant Temperature (ECT) sensor signal changed too much too quickly. Note: The ECT sensor should read 0.47v-0.78v at hot idle speed.

Possible Causes:



ECT sensor signal circuit is open (an intermittent fault)
 
ECT sensor signal circuit is shorted to ground (intermittent)
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0117

Engine Coolant Temperature Sensor Circuit Low Input

Trouble Code Conditions: Key on or engine running, and the PCM detected the Engine Coolant Temperature (ECT) sensor signal indicated more than 302ºF (0.1v). Note: The normal range of the ECT sensor is from 0.47v to 0.78v.

Possible Causes:



ECT sensor signal shorted to chassis ground
 
ECT sensor signal shorted to sensor ground circuit
 
ECT sensor has an internal failure (it is shorted) or has failed
 
PCM has failed
 

Trouble Code: P0118

Engine Coolant Temperature Sensor Circuit High Input

Trouble Code Conditions: Key on or engine running, and the PCM detected the Engine Coolant Temperature (ECT) sensor signal indicated less than -4ºF (4.9v). Note: The normal range of the ECT sensor is from 0.47v to 0.78v.

Possible Causes:



IAT sensor signal shorted to VREF or system power
 
IAT sensor signal circuit is open
 
IAT sensor ground circuit is open
 
Sensor has an internal failure (it is open)
 
PCM has failed
 

Trouble Code: P0122

Throttle Position Sensor Circuit Low Input

Trouble Code Conditions: Engine running in closed loop conditions, and the PCM detected the closed throttle TP signal was less than 0.16v (less than 10% open).

Possible Causes:



TP sensor signal circuit is shorted to ground
 
TP sensor VREF circuit is open
 
TP sensor VREF circuit is shorted to ground
 
TP sensor is damaged (it may be shorted internally)
 
PCM has failed
 

Trouble Code: P0123

Throttle Position Sensor Circuit High Input

Trouble Code Conditions: Engine running in closed loop conditions, and the PCM detected the wide-open-throttle TP signal was more than 4.60v (more than 90%).

Possible Causes:



TP sensor signal circuit is shorted to VREF
 
TP sensor signal circuit is shorted to system power
 
TP sensor ground circuit is open between sensor and the PCM
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0128

Thermostat Range/Performance

Trouble Code Conditions: DTC P0107, P0108, P0112, P0113, P0116-118, P0335, P0336, P0300-P0306, P0401, P0505, P1106-P1108, P1259 and P1519, engine running at road load for 10 minutes, and the PCM detected the ECT sensor input did not reach the correct closed loop value. Note: It is possible for this code to set if the engine is left running while the hood is open for an extended period in a warm climate.

Possible Causes:



Inspect for low coolant level or for an incorrect coolant mixture
 
Check the operation of the thermostat (it may be stuck open)
 
TSB 01-064 (9/11/01) contains a repair procedure for this code
 

Trouble Code: P0131

HO2S-11 (Bank 1 Sensor 1) Circuit Low Input

Trouble Code Conditions: Engine running in closed loop in 4th or 6th gear at cruise speed, and the PCM detected the HO2S signal was fixed at less than 0.50v. Note: The actual value to set the code is stored in the PCM memory.

Possible Causes:



HO2S signal circuit is open or it is shorted to ground
 
HO2S may be contaminated or may have failed
 
Fuel supply system is too lean (fuel filter is clogged or dirty)
 
PCM has failed
 

Trouble Code: P0132

HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Trouble Code Conditions: Engine running in closed loop in 4th or 6th gear at cruise speed, and the PCM detected the HO2S signal was fixed at more than 0.90v. Note: The actual value to set the code is stored in the PCM memory.

Possible Causes:



HO2S signal tracking (wet/oily) in connector causing a short between the signal circuit and heater power circuit
 
HO2S signal circuit is open, or the ground circuit is open
 
HO2S heater supply circuit is open
 
PCM has failed
 

Trouble Code: P0133

HO2S-11 (Bank 1 Sensor 1) Circuit Slow Response

Trouble Code Conditions: Engine running in closed loop in 4th or 6th gear at over 55 mph at steady speed, and the PCM detected the HO2S response time to switch between 300-600 mv was too slow, or that the rich to lean or lean to rich switch time was too slow.

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
O2S element fuel contamination
 
O2S element has deteriorated
 
PCM has failed
 

Trouble Code: P0135

HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Trouble Code Conditions: Engine runtime over 80 seconds, and the PCM detected an incorrect signal value at the HO2S heater circuit during the test period.

Possible Causes:



Main relay output (power) circuit to the heater is open
 
O2S heater ground circuit is open
 
O2S heater element has high resistance
 
O2S heater element has an open condition
 
O2S heater element has a shorted condition
 
PCM has failed
 

Trouble Code: P0137

HO2S-12 (Bank 1 Sensor 2) Circuit Low Input

Trouble Code Conditions: Engine running in closed loop in 4th or 6th gear at cruise speed, and the PCM detected the HO2S signal was fixed at less than 0.30v. Note: The actual value where the code sets is in the PCM memory.

Possible Causes:



HO2S signal circuit is open
 
HO2S signal circuit is shorted to ground
 
HO2S ground circuit is open
 
HO2S may be contaminated or may have failed
 
PCM has failed
 

Trouble Code: P0138

HO2S-12 (Bank 1 Sensor 2) Circuit High Input

Trouble Code Conditions: Engine running in closed loop in 4th or 6th gear at cruise speed, and the PCM detected the HO2S signal was fixed at more than 0.60v. Note: The actual value where the code sets is in the PCM memory.

Possible Causes:



HO2S signal tracking (wet/oily) in connector causing a short between the signal circuit and heater power circuit
 
HO2S signal circuit is open, or the ground circuit is open
 
HO2S heater supply circuit is open
 
PCM has failed
 

Trouble Code: P0139

HO2S-12 (Bank 1 Sensor 2) Circuit Slow Response

Trouble Code Conditions: Engine running in closed loop in 4th or 6th gear at over 55 mph at steady speed, and the PCM detected the HO2S response time to switch between 300-600 mv was too slow, or that the rich to lean or lean to rich switch time was too slow.

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
HO2S element fuel contamination
 
HO2S element has deteriorated
 
PCM has failed
 

Trouble Code: P0141

HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction

Trouble Code Conditions: Engine runtime over 80 seconds, and the PCM detected an incorrect signal value at the HO2S heater circuit during the test period.

Possible Causes:



Main relay output (power) circuit to the heater is open
 
HO2S heater ground circuit is open
 
HO2S heater element has high resistance
 
HO2S heater element has an open condition
 
HO2S heater element has a shorted condition
 
PCM has failed
 

Trouble Code: P0155

HO2S-21 (Bank 2 Sensor 1) Heater Circuit Malfunction

Trouble Code Conditions: Engine runtime over 80 seconds, and the PCM detected an incorrect signal value at the HO2S heater circuit during the test period.

Possible Causes:



Main relay output (power) circuit to the heater is open
 
O2S heater ground circuit is open
 
O2S heater element has high resistance
 
O2S heater element has an open condition
 
O2S heater element has a shorted condition
 
PCM has failed
 

Trouble Code: P0158

HO2S-22 (Bank 2 Sensor 2) Circuit High Input

Trouble Code Conditions: Engine running in closed loop in 4th or 6th gear at cruise speed, and the PCM detected the HO2S signal was fixed at more than 0.60v. Note: The actual value where the code sets is in the PCM memory.

Possible Causes:



HO2S signal tracking (wet/oily) in connector causing a short between the signal circuit and heater power circuit
 
HO2S signal circuit is open, or the ground circuit is open
 
HO2S heater supply circuit is open
 
PCM has failed
 

Trouble Code: P0161

HO2S-22 (Bank 2 Sensor 2) Heater Circuit Malfunction

Trouble Code Conditions: Engine runtime over 80 seconds, and the PCM detected an incorrect signal value at the HO2S heater circuit during the test period.

Possible Causes:



Main relay output (power) circuit to the heater is open
 
O2S heater ground circuit is open
 
O2S heater element has high resistance
 
O2S heater element has an open condition
 
O2S heater element has a shorted condition
 
PCM has failed
 

Trouble Code: P0171

Fuel System Too Lean (Bank 1)

Trouble Code Conditions: DTC P0107, P0108, P0135, P0137, P0138, P0141, P1128, P1129 and P1259 not set, engine running in closed loop, and the PCM detected the LONGFT value exceeded the calibrated lean limit value

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
One or more injectors restricted or pressure regulator has failed
 
Air is being drawn in from leaks in gaskets or other seals
 
O2S element is deteriorated or has failed
 
A "fuel control" sensor is out of calibration (ECT, IAT or MAP)
 
PCM has failed
 

Trouble Code: P0172

Fuel System Too Rich (Bank 1)

Trouble Code Conditions: DTC P0107, P0108, P0135, P0137, P0138, P0141, P1128, P1129 and P1259 not set, engine running in closed loop, and the PCM detected the LONGFT value exceeded the calibrated rich limit. Note: A high MAP sensor signal at idle can cause this code to set.

Possible Causes:



Leaking/contaminated fuel injector(s) or fuel pressure regulator
 
HO2S element may be contaminated with water or alcohol
 
EVAP vapor recovery system has failed (pulling vacuum)
 
Base engine fault (i.e., cam timing incorrect, engine oil too high
 

Trouble Code: P0300

Multiple Misfire Detected

Trouble Code Conditions: DTC P0107, P0108, P0131, P0132, P0171, P0172, P1128, P0335, P0336, P0505, P1128, P1129, P1259, P1361, P1362, P1366, P1367 and P1519 not set, engine running under positive torque conditions, and the PCM detected a misfire in 2 or more cylinders. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:



CKP or CMP sensor problem affecting more than one cylinder
 
Fuel system problem affecting more than one cylinder
 
Ignition system problem affecting more than one cylinder
 
Base engine mechanical fault affecting more than 1 cylinder
 

Trouble Code: P0301

Cylinder 1 Misfire Detected

Trouble Code Conditions: DTC P0107, P0108, P0131, P0132, P0171, P0172, P1128, P0335, P0336, P0505, P1128, P1129, P1259, P1361, P1362, P1366, P1367 and P1519 not set, engine running under positive torque conditions, and the PCM detected a misfire condition in one cylinder. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:



Fuel system problem affecting only Cylinder 1
 
Ignition system problem affecting Cylinder 1
 
Base engine (mechanical) problem affecting only Cylinder 1
 

Trouble Code: P0302

Cylinder 2 Misfire Detected

Trouble Code Conditions: DTC P0107, P0108, P0131, P0132, P0171, P0172, P1128, P0335, P0336, P0505, P1128, P1129, P1259, P1361, P1362, P1366, P1367 and P1519 not set, engine running under positive torque conditions, and the PCM detected a misfire condition in one cylinder. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:



Fuel system problem affecting only Cylinder 2
 
Ignition system problem affecting Cylinder 2
 
Base engine (mechanical) problem affecting only Cylinder 2
 

Trouble Code: P0303

Cylinder 3 Misfire Detected

Trouble Code Conditions: DTC P0107, P0108, P0131, P0132, P0171, P0172, P1128, P0335, P0336, P0505, P1128, P1129, P1259, P1361, P1362, P1366, P1367 and P1519 not set, engine running under positive torque conditions, and the PCM detected a misfire condition in one cylinder. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:



Fuel system problem affecting only Cylinder 3
 
Ignition system problem affecting Cylinder 3
 
Base engine (mechanical) problem affecting only Cylinder 3
 

Trouble Code: P0304

Cylinder 4 Misfire Detected

Trouble Code Conditions: DTC P0107, P0108, P0131, P0132, P0171, P0172, P1128, P0335, P0336, P0505, P1128, P1129, P1259, P1361, P1362, P1366, P1367 and P1519 not set, engine running under positive torque conditions, and the PCM detected a misfire condition in one cylinder. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:



Fuel system problem affecting only Cylinder 4
 
Ignition system problem affecting Cylinder 4
 
Base engine (mechanical) problem affecting only Cylinder 4
 

Trouble Code: P0305

Cylinder 5 Misfire Detected

Trouble Code Conditions: DTC P0107, P0108, P0131, P0132, P0171, P0172, P1128, P0335, P0336, P0505, P1128, P1129, P1259, P1361, P1362, P1366, P1367 and P1519 not set, engine running under positive torque conditions, and the PCM detected a misfire condition in one cylinder. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:



Fuel system problem affecting only Cylinder 5
 
Ignition system problem affecting Cylinder 5
 
Base engine (mechanical) problem affecting only Cylinder 5
 

Trouble Code: P0306

Cylinder 6 Misfire Detected

Trouble Code Conditions: DTC P0107, P0108, P0131, P0132, P0171, P0172, P1128, P0335, P0336, P0505, P1128, P1129, P1259, P1361, P1362, P1366, P1367 and P1519 not set, engine running under positive torque conditions, and the PCM detected a misfire condition in one cylinder. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:



Fuel system problem affecting only Cylinder 6
 
Ignition system problem affecting Cylinder 6
 
Base engine (mechanical) problem affecting only Cylinder 6
 

Trouble Code: P0325

Knock Sensor (Rear) Circuit Malfunction

Trouble Code Conditions: Engine running for over 1 minute, and the PCM detected an incorrect signal at the rear Knock Sensor (KS) circuit during the test.

Possible Causes:



Knock sensor signal circuit is open (rear bank of engine)
 
Knock sensor signal circuit is grounded (rear bank of engine)
 
Knock sensor not tightened properly
 
Knock sensor damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0330

Knock Sensor (Front) Circuit Malfunction

Trouble Code Conditions: Engine running for over 1 minute, and the PCM detected an incorrect signal at the front Knock Sensor (KS) circuit during the test.

Possible Causes:



Knock sensor signal circuit is open (front bank of engine)
 
Knock sensor signal circuit is grounded (front bank of engine)
 
Knock sensor not tightened properly
 
Knock sensor damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0335

CKP Sensor 'A' Circuit Malfunction (No Signal)

Trouble Code Conditions: Engine running, and the PCM did not detect any signals from the Crankshaft Position (CKP) Sensor 'A' during the test period. Note: The engine will crank for a longer period of time, may buck or jerk, but it will start and run without the CKP sensor signal present.

Possible Causes:



CKP Sensor 'A' signal circuit is open or shorted to ground
 
CKP Sensor 'A' signal circuit shorted to VREF or system power
 
CKP Sensor 'A' is damaged or has failed
 
PCM has failed
 

Trouble Code: P0336

CKP Sensor 'A' Circuit Range/Performance

Trouble Code Conditions: Engine running, and the PCM detected the Crankshaft Position (CKP) Sensor 'A' signal was missing for a short period of time. Note: This trouble code is usually caused by an intermittent fault.

Possible Causes:



CKP Sensor 'A' signal circuit is open or shorted to ground
 
CKP Sensor 'A' signal circuit shorted to VREF or system power
 
CKP Sensor 'A' is damaged or has failed
 
PCM has failed
 

Trouble Code: P0401

EGR System Insufficient Flow Detected

Trouble Code Conditions: Cold engine startup requirement met (ECT sensor less than 76ºF at startup), engine running in closed loop at 40-55 mph for 2 minutes in Drive (D4), followed by a deceleration period back to 35 mph with the throttle closed, and the PCM detected a signal from the EGR position sensor that indicated insufficient EGR flow during the test.

Possible Causes:



EGR valve source vacuum supply line open or restricted
 
EGR intake or exhaust manifold passages are restricted
 
EGR valve assembly or solenoid valve damaged or has failed
 
EGR constant vacuum control (CVC) valve is dirty or damaged
 
PCM has failed
 

Trouble Code: P0420

Catalyst Efficiency Below Threshold (Bank 1)

Trouble Code Conditions: DTC P0137, P0138 and P0141 not set, engine running in closed loop at 40-55 mph for 2 minutes, followed by a deceleration period to 35 mph at closed throttle, and the PCM detected excessive activity in the Catalyst oxygen sensor (rear HO2S) during the test period.

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter damaged or has failed (deteriorated)
 
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 

Trouble Code: P0441

EVAP System Incorrect Purge Flow

Trouble Code Conditions: Cold engine startup (ECT sensor signal less than 154ºF and IAT sensor signal more than 14ºF at startup), engine runtime from 3-5 minutes, followed by an acceleration period to 50-60 mph at steady throttle, and the PCM did not detect enough purge flow through the EVAP system during the EVAP Monitor flow test.

Possible Causes:



EVAP purge control diaphragm valve hose loose/disconnected
 
EVAP purge cutoff or purge control solenoid valve is damaged
 
EVAP purge control diaphragm valve is damaged or has failed
 
PCM has failed
 

 
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