Ram B1500, B2500, B3500, 1999-2003

5.9L L6 VIN 7 Std 3

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Trouble Code: P0254



Injector Pump Fuel Valve Current Too High

Possible Causes:



Fuel injection pump is damaged or it has failed
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects two or more cylinders
 
Erratic or interrupted CKP or CMP Sensor signals
 
Fuel delivery component fault that affects two or more cylinders (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) in two or more cylinders
 
Vehicle driven with low fuel pressure or while very low on fuel
 

Trouble Code: P0301



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0302



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0303



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0304



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0305



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0306



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0307



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0308



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0309



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0310



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0315



No Crankshaft Position Sensor Learned

Possible Causes:



Crankshaft tone wheel flex plate is damaged
 
Tone wheel/pulse ring may be damaged
 
Erratic CKP Sensor signals (wiring/connector problem)
 
CKP Sensor has failed
 
PCM has failed
 

Trouble Code: P0320



No Crank Reference Signal to PCM

Possible Causes:



CKP Sensor signal circuit is open or grounded
 
CKP Sensor VREF circuit is open or grounded
 
Tone wheel or flex plate damage or erratic CKP Sensor signals
 
CKP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0325



Knock Sensor No. 1 Circuit

Possible Causes:



Knock Sensor connector is damaged or shorted
 
Knock Sensor signal circuit open or grounded
 
Knock Sensor signal circuit shorted to return circuit
 
Knock Sensor return circuit is open
 
Knock Sensor not tightened properly
 
Knock Sensor damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0335



Crankshaft Position Sensor Circuit

Possible Causes:



Intermittent CKP signal
 
CKP Sensor signal circuit is open or it is shorted to ground or voltage
 
CKP Sensor 5v supply circuit is open or shorted to ground or voltage
 
CKP Sensor ground circuit is open
 
CKP Sensor or CMP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0336



Crankshaft Position Sensor Signal

Possible Causes:



Check the tone or pulse ring for damage or debris collection
 
CKP Sensor signal circuit is open or shorted to ground
 
CKP Sensor VREF circuit is open or shorted to ground
 
CKP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0339



Crankshaft Position Sensor Circuit Intermittent

Possible Causes:



Check the tone wheel/pulse ring for damage or debris collection
 
CKP Sensor signal circuit is open or shorted to ground
 
CKP Sensor 5v supply circuit is open or shorted to ground
 
CKP Sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0340



No Camshaft Position Sensor Circuit Failure

Possible Causes:



CMP Sensor connector is damaged, open or it is shorted
 
CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit
 
CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage
 
CMP Sensor ground circuit is open
 
CMP Sensor is damaged or has failed
 
CKP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0341



Camshaft Position Sensor Signal

Possible Causes:



CMP Sensor signal circuit is open or shorted to ground
 
CMP Sensor VREF circuit is open or shorted to ground
 
CMP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0342



CMP Sensor Supply Voltage Too Low

Possible Causes:



CMP Sensor connector is damaged, open or it is shorted
 
CMP Sensor VREF circuit is open
 
CMP Sensor VREF circuit is shorted to ground
 
CMP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0343



CMP Sensor Supply Voltage Too Low

Possible Causes:



CMP Sensor signal circuit is open (intermittent fault)
 
CMP Sensor signal circuit shorted to ground (intermittent fault)
 
CMP Sensor ground circuit is open (an intermittent fault)
 
PCM has failed
 

Trouble Code: P0344



Camshaft Position Sensor Circuit Intermittent

Possible Causes:



Wiring harness fault
 
5v supply circuit open or shorted to ground
 
Tone wheel/pulse ring is damaged or corroded
 
CMP Sensor has failed
 
CMP Sensor signal circuit is open, shorted to ground or battery voltage or 5v supply
 
CMP Sensor ground circuit is open
 
PCM has failed
 

Trouble Code: P0350



Ignition Coil Current Too High

Possible Causes:



Ignition Coil No. 1, 2 or 3 control circuit (the coil windings) shorted internally
 
Ignition Coil No. 1, 2 or 3 control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0351



Ignition Coil No. 1, 2 or 3 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition Coil No. 1, 2 or 3 primary "driver" circuit open or grounded
 
Ignition Coil No. 1, 2 or 3 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0352



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0353



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0354



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0355



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0356



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0357



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0358



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0370



Fuel Injection Pump Speed Sensor Signal Lost

Possible Causes:



ECM cannot control the engine speed through circuit WP44
 
Fuel Injection pump has failed due to an internal problem
 

Trouble Code: P0380



Intake Air Heater Relay No. 1 Control Circuit

Possible Causes:



Intake Air Heater relay control circuit open or shorted to ground
 
Intake Air Heater relay ground circuit is open
 
Intake Air Heater relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0381



Wait To Start Lamp Inoperative

Possible Causes:



Wait To Start lamp driver circuit shorted to ground (the lamp will be on continuously)
 
Wait To Start lamp driver circuit open (lamp will not come on)
 
Wait To Start bulb has failed
 
Wait To Start ignition feed circuit is open, or the Cluster is open
 
PCM has failed
 

Trouble Code: P0382



Intake Air Heater Relay No. 2 Control Circuit

Possible Causes:



Intake air heater relay control circuit is open or shorted to ground
 
Intake air heater relay power circuit is open
 
Intake air heater relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0401



EGR System Fault

Possible Causes:



EGR valve control circuit open, grounded or shorted to power
 
EGR exhaust transfer tubes blocked in the exhaust manifold
 
ASD relay power circuit open to the EGR solenoid
 
EGR valve is damaged or has failed
 
PCM has failed
 
TSB 18-33-98 contains a repair procedure for this code
 

Trouble Code: P0403



EGR Solenoid Circuit

Possible Causes:



EGR solenoid ground circuit is open
 
EGR solenoid control circuit is open or shorted to ground or to voltage
 
EGR solenoid power circuit is open
 
EGR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0404



EGR Position Sensor Signal Performance

Possible Causes:



EGR Sensor signal circuit is open or shorted to ground
 
EGR Sensor 5v supply circuit is open or has high resistance
 
EGR Sensor ground circuit is open
 
EGR solenoid control circuit has a problem
 
EGR valve actuator loose, sticking, blocked or improperly grounded
 
EGR Sensor is damaged or has failed
 
Intermittent condition
 
PCM has failed
 

Trouble Code: P0405



EGR Position Sensor Circuit Low Input

Possible Causes:



EGR Sensor signal circuit is shorted to ground or open
 
EGR Sensor VREF (5v) circuit is open or shorted to ground
 
EGR Sensor is damaged (shorted internally) or it has failed
 
EGR position internal failure
 
PCM has failed
 

 
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