Corvette 1997-2005

5.7L V8 VIN G Std 4

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Trouble Code: P1221



TP Sensor 1-2 Signal Correlation

Possible Causes:



TP1, 2 sensor signal circuit has a high resistance condition
 
TP1, 2 sensor VREF circuit has a high resistance condition
 
TP1, 2 sensor ground circuit has a high resistance condition
 
TP1, 2 sensor is damaged or has failed
 
TAC controller or the throttle body is damaged or has failed
 
TSB 02-06-04-005 contains a repair procedure for this code
 

Trouble Code: P1275



Accelerator Pedal Position Sensor 1 Circuit Malfunction

Possible Causes:



APP1 sensor connector is contaminated, oily or contains water
 
APP1 sensor signal, ground or VREF circuit high resistance
 
APP1 sensor VREF circuit is open, shorted to ground or to B+
 
APP1 sensor signal or ground circuit has high resistance
 
APP1 sensor is damaged or has failed
 
TAC module is damaged or has failed
 

Trouble Code: P1276



Accelerator Pedal Position Sensor 1 Range/Performance

Possible Causes:



APP1 sensor connector is contaminated, oily or contains water
 
APP1 sensor signal circuit is open or shorted to ground
 
APP1 sensor signal circuit is shorted to VREF or system power
 
APP1 sensor ground circuit is open or has high resistance
 
APP1 sensor VREF circuit is open or shorted to ground
 
APP1 sensor is damaged or has failed
 

Trouble Code: P1280



Accelerator Pedal Position Sensor 2 Circuit Malfunction

Possible Causes:



APP2 sensor connector is contaminated, oily or contains water
 
APP2 sensor signal, ground or VREF circuit high resistance
 
APP2 sensor VREF circuit is open, shorted to ground or to B+
 
APP2 sensor signal or ground circuit has high resistance
 
APP2 sensor is damaged or has failed
 
TAC module is damaged or has failed
 

Trouble Code: P1281



Accelerator Pedal Position Sensor 2 Range/Performance

Possible Causes:



TP2 sensor connector is contaminated, oily or contains water
 
TP2 sensor signal, ground or VREF circuit has high resistance
 
TP2 sensor VREF circuit is open, shorted to ground or to B+
 
TP2 sensor signal or ground circuit has high resistance
 
TP2 sensor is damaged or has failed
 
TAC module is damaged or has failed
 

Trouble Code: P1285



Accelerator Pedal Position Sensor 3 Circuit Malfunction

Possible Causes:



APP3 sensor connector is contaminated, oily or contains water
 
APP3 sensor signal, ground or VREF circuit high resistance
 
APP3 sensor VREF circuit is open, shorted to ground or to B+
 
APP3 sensor signal or ground circuit has high resistance
 
APP3 sensor or the TAC module is damaged or has failed
 

Trouble Code: P1286



Accelerator Pedal Position Sensor 3 Range/Performance

Possible Causes:



APP3 sensor connector is contaminated, oily or moisture
 
APP3 sensor signal, ground or VREF circuit high resistance
 
APP3 sensor signal or ground circuit has high resistance
 
APP3 sensor or the TAC module is damaged or has failed
 

Trouble Code: P1336



CKP Sensor System Variation Not Learned

Possible Causes:



Set the parking brake and block the drive wheels for safety.
 
Verify the hood is closed.
 
Read the trouble codes. If a code is set, refer to that code.
 
Start the engine. Allow engine temperature to reach at least 158ºF (70ºC). Then key off.
 
Select Crankshaft Position Variation Learn procedure on Scan Tool & start the vehicle.
 
Apply the brake pedal firmly and verify the selector is in Park.
 
Increase accelerator pedal position until fuel cutoff is reached at the test rpm (e.g., 5150). Quickly release the accelerator pedal after fuel cutoff is reached. The CKP system variation compensating values are learned when the engine speed (rpm) decreases back to idle speed and the procedure terminates.
 
Read the trouble codes and recheck for DTC P1336.
 
If DTC P1336 runs and passes, the CKP system variation "learn" procedure is complete. If not, look for other codes. If no codes are set, repeat the test procedure.
 

Trouble Code: P1380



EBTCM DTC Detected, Rough Road Data Unusable

Possible Causes:



Service the ABS before diagnosing a misfire because an actual engine misfire may or may not exist. Also, an actual engine misfire may have occurred during an ABS fault.
 
Determine if the vehicle was driven on a rough road, and the ABS could not detect this due to a malfunction. The PCM may interpret variations in crankshaft speed caused by the rough road as a misfire without an actual engine misfire present.
 
Refer to Diagnostic System Check for Antilock Brake System
 

Trouble Code: P1381



Misfire Detected - No Communication With The EBCM

Possible Causes:



Verify with a Scan Tool that the EBCM can transmit serial data on the Class 2 serial data circuit. Service the EBCM as needed before diagnosing a misfire because an actual engine misfire may or may not exist. An engine misfire may have occurred during a period when the EBCM could not communicate.
 
Refer to Diagnostic System Check for Antilock Brake System
 

Trouble Code: P1415



Secondary Air Injection System (Bank 1) Malfunction

Possible Causes:



Air hoses disconnected, loose, kinked or failed (a burnt hose)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
PCM has failed
 

Trouble Code: P1416



Secondary Air Injection System (Bank 2) Malfunction

Possible Causes:



Air hoses disconnected, loose, kinked or failed (a burnt hose)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
PCM has failed
 

Trouble Code: P1431



Fuel Level Sensor 2 Signal Range/Performance

Possible Causes:



The fuel tanks over filled.
 
Fuel level almost empty, then re-fueled with only a few gallons
 
The Fuel Level sender became un-stuck during refueling
 
The Fuel Level sender un-stuck on rough road or while turning
 
Fuel level sender circuit is open or shorted to ground
 

Trouble Code: P1432



Fuel Level Sensor 2 Circuit Low Input

Possible Causes:



Fuel level sensor connector is damaged or shorted
 
Fuel level sensor signal circuit is shorted to ground
 
Fuel level sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1433



Fuel Level Sensor (Right Side) Circuit High Input

Possible Causes:



Fuel level sensor connector is damaged, loose or open
 
Fuel level sensor signal circuit is open or shorted to VREF
 
Fuel level sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1441



EVAP System Flow During Non-Purge

Possible Causes:



An improperly installed or damaged EVAP canister purge valve
 
A temporary blockage in the EVAP canister purge valve, purge pipe, or EVAP canister
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
Purge solenoid valve is damaged or has failed
 
PCM has failed
 

Trouble Code: P1514



Throttle Body Performance

Possible Causes:



Inspect the throttle blade for damage and/or proper installation
 
Inspect the TAC module connectors for signs of water intrusion. When water intrusion occurs, multiple codes can set with no circuit or component faults apparent at the time.
 
Move throttle blade from closed to wide open position without applying much force. It should move smoothly through the full range and return to a slightly open position.
 
If the TAC module detects a fault in the system, it may set more than one related code because of the many redundant tests that run continuously on this system.
 

Trouble Code: P1515



Control Module Throttle Actuator Position Performance

Possible Causes:



Throttle actuator motor CKT 1 or CKT 2 is open, shorted to ground or B+
 
Throttle actuator motor is damaged or has failed
 
Throttle actuator motor control module has failed
 

Trouble Code: P1516



TAC Module Throttle Actuator Position Performance

Possible Causes:



Throttle actuator motor CKT 1 is open, shorted to ground or B+
 
Throttle actuator motor CKT 2 is open, shorted to ground or B+
 
Throttle actuator motor CKT 1 is shorted to CKT 2
 
Throttle actuator motor is damaged or has failed
 
Throttle actuator motor control module has failed
 

Trouble Code: P1517



Throttle Actuator Control Module Performance

Possible Causes:



Test the charging system output (low voltage can set this code)
 
Inspect the TAC module connectors for signs of water intrusion. If water intrusion occurs, multiple codes may set without any circuit or component conditions present.
 
When the TAC module detects a fault condition, several TAC related codes set because there are redundant tests running.
 
TAC module has failed
 

Trouble Code: P1518



Throttle Actuator Control Module Serial Data Malfunction

Possible Causes:



DTC P1518 sets if the battery voltage is low. If the customer's concern is slow cranking or no crank due to low battery voltage, ignore the DTC P1518. Clear codes and retest.
 
DTC P1518 also sets when there is a short to B+ on the TAC module ground circuit. Inspect the fuses for the circuits that are in the TAC module harness (e.g., Brake & Cruise) for the fault.
 
DTC P1518 sets if the TAC module power circuit is shorted to a B+ supply circuit. The TAC module stays powered-up when the ignition switch is turned off. When the key on, the TAC module is powered-up before the PCM gets power. DTC 1518 is set because the TAC module did not detect signals from the PCM.
 
TAC module has failed
 

Trouble Code: P1539



A/C Clutch Feedback Circuit High Input

Possible Causes:



A/C clutch status circuit is shorted to system power (B+)
 
A/C clutch relay is damaged or has failed (contacts are stuck)
 

Trouble Code: P1546



A/C Clutch Feedback Circuit Low Input

Possible Causes:



A/C clutch status line is open or shorted to ground
 
A/C clutch relay is damaged or has failed (contains not closing)
 
A/C clutch relay power circuit is open (test AC CRUISE fuse)
 
PCM has failed
 

Trouble Code: P1574



Stoplamp Switch Circuit Malfunction

Possible Causes:



Brake switch circuit is open, shorted to ground or shorted to B+
 
Brake switch power circuit is open (test STOP/HAZARD fuse)
 
Brake switch is out-of-adjustment, damaged or has failed
 
EBTCM has failed
 

Trouble Code: P1575



Extended Travel Brake Switch Circuit Malfunction

Possible Causes:



Brake switch circuit is open, shorted to ground or shorted to B+
 
Brake switch power circuit is open (test the ENGIGN1 fuse)
 
Brake switch is out-of-adjustment, damaged or has failed
 
EBTCM has failed
 

Trouble Code: P1626



Theft Deterrent Fuel Enable Signal Lost

Possible Causes:



Check the "fuel enable " circuit for an open, short to ground or short to system power (B+) condition
 
Perform the Powertrain Onboard Diagnostic System Check
 
BCM or PCM may have failed
 

Trouble Code: P1630



Theft Deterrent Learn Mode Active

Possible Causes:



Refer to Diagnostic System Check for the Body Control Module
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1631



Theft Deterrent Enable Signal Not Correct

Possible Causes:



Refer to Programming the Theft Deterrent System
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1635



5-Volt Reference 1 Circuit Malfunction

Possible Causes:



5v VREF circuit is shorted to sensor ground or chassis ground
 
5v VREF circuit, TP or MAP sensor circuit is shorted to (B+)
 
5v VREF circuit shorted to EGR sensor High signal circuit
 
EGR solenoid valve (and sensor) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1637



Generator 'L' Terminal Circuit Malfunction

Possible Causes:



A Scan Tool should display Inactive for the 'L' Terminal and 10-40% for the 'F' Terminal with the ignition "on". With the engine running, the display should indicate the 'L' Terminal is Active and the 'F' Terminal is higher than 5% on the tool display.
 
Generator 'L terminal circuit shorted to ground or to power (B+)
 
Generator 'F' terminal circuit is open or shorted to ground
 
Generator is damaged or has failed or the PCM has failed
 

Trouble Code: P1638



Generator 'F' Terminal Circuit Malfunction

Possible Causes:



Generator connector is damaged or has high resistance
 
Generator field duty cycle signal circuit is open or shorted
 
Generator is damaged or has failed
 
PCM has failed
 

Trouble Code: P1639



5-Volt Reference 2 Circuit Malfunction

Possible Causes:



A/C refrigerant pressure sensor VREF circuit is open or shorted to ground
 
A/C refrigerant pressure sensor VREF circuit is shorted to system power
 
A/C pressure sensor or FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1652



Powertrain Induced Chassis Pitch Output Circuit Malfunction

Possible Causes:



Chassis pitch output circuit is open, shorted to ground or to B+
 
Electronic Suspension Control Module has failed
 
PCM has failed
 

Trouble Code: P1689



Traction Control Delivered Torque Output Circuit Malfunction

Possible Causes:



Delivered torque circuit is open, shorted to ground or to B+
 
EBTCM is damaged or has failed
 
PCM has failed
 

Trouble Code: U1000



Class 2 Communication Malfunction

Possible Causes:



Class 2 circuit is open, shorted to ground or shorted to power
 
PCM ignition power circuit(s) has a high resistance condition
 
PCM main ground circuit(s) has a high resistance condition
 
SDM (module) could be shorted pulling the voltage low
 

Trouble Code: U1016



No Communication With Powertrain Control Module

Possible Causes:



PCM Class 2 circuit is open, shorted to ground or to B+
 
PCM ignition power circuit(s) has a high resistance condition
 
PCM main ground circuit(s) has a high resistance condition
 
PCM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1048



No Communication With Rear Wheel Steering Control Module

Possible Causes:



RWSCM Class 2 circuit is open, shorted to ground or to B+
 
RWSCM ignition power circuit has a high resistance condition
 
RESCM main ground circuit(s) has a high resistance condition
 
RESCM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1064



No Communication With Body Control Module

Possible Causes:



BCM Class 2 circuit is open, shorted to ground or to B+
 
BCM ignition power circuit has a high resistance condition
 
BCM main ground circuit(s) has a high resistance condition
 
BCM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1088



No Communication With SDM (Restraint Module)

Possible Causes:



SDM Class 2 circuit is open, shorted to ground or to B+
 
SDM ignition power circuit has a high resistance condition
 
SDM main ground circuit(s) has a high resistance condition
 
SDM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1096



No Communication With Instrument Panel Cluster

Possible Causes:



IPC Class 2 circuit is open, shorted to ground or to B+
 
IPC ignition power circuit has a high resistance condition
 
IPC main ground circuit(s) has a high resistance condition
 
IPC (module) may have failed and is pulling the circuit low
 

 
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