1996 Chevrolet Forward Control 6.5 F, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Performance DTCS (Diesel)

ENGINE PERFORMANCE DTCS (DIESEL)

DTC Description
P0112 INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT LOW
P0113 INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT HIGH VOLTAGE
P0117 ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT LOW VOLTAGE
P0118 ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT HIGH VOLTAGE
P0121 ACCELERATOR PEDAL POSITION (APP) SENSOR 1 CIRCUIT PERFORMANCE
P0122 ACCELERATOR PEDAL POSITION (APP) SENSOR 1 CIRCUIT LOW VOLTAGE
P0123 ACCELERATOR PEDAL POSITION (APP) SENSOR 1 CIRCUIT HIGH VOLTAGE
P0182 FUEL TEMPERATURE SENSOR CIRCUIT LOW VOLTAGE
P0183 FUEL TEMPERATURE SENSOR CIRCUIT HIGH VOLTAGE
P0215 ENGINE SHUTOFF SOLENOID CONTROL CIRCUIT
P0216 INJECTION TIMING CONTROL SYSTEM
P0219 ENGINE OVERSPEED CONDITION
P0220 ACCELERATOR PEDAL POSITION (APP) SENSOR 2 CIRCUIT
P0221 ACCELERATOR PEDAL POSITION (APP) SENSOR 2 CIRCUIT PERFORMANCE
P0222 ACCELERATOR PEDAL POSITION (APP) SENSOR 2 CIRCUIT LOW VOLTAGE
P0223 ACCELERATOR PEDAL POSITION (APP) SENSOR 2 CIRCUIT HIGH VOLTAGE
P0225 ACCELERATOR PEDAL POSITION (APP) SENSOR 3 CIRCUIT
P0226 ACCELERATOR PEDAL POSITION (APP) SENSOR 3 CIRCUIT PERFORMANCE
P0227 ACCELERATOR PEDAL POSITION (APP) SENSOR 3 CIRCUIT LOW VOLTAGE
P0228 ACCELERATOR PEDAL POSITION (APP) SENSOR 3 CIRCUIT HIGH VOLTAGE
P0231 LIFT PUMP SECONDARY CIRCUIT LOW VOLTAGE
P0236 TURBOCHARGER BOOST SYSTEM
P0237 TURBOCHARGER BOOST SENSOR CIRCUIT LOW VOLTAGE
P0238 TURBOCHARGER BOOST SENSOR CIRCUIT HIGH VOLTAGE
P0251 INJECTION PUMP CAM SYSTEM
P0263 CYLINDER 8 BALANCE SYSTEM
P0266 CYLINDER 7 BALANCE SYSTEM
P0269 CYLINDER 2 BALANCE SYSTEM
P0272 CYLINDER 6 BALANCE SYSTEM
P0275 CYLINDER 5 BALANCE SYSTEM
P0278 CYLINDER 4 BALANCE SYSTEM
P0281 CYLINDER 3 BALANCE SYSTEM
P0284 CYLINDER 1 BALANCE SYSTEM
P0335 CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT
P0370 TIMING REFERENCE HIGH RESOLUTION
P0380 GLOW PLUG CIRCUIT PERFORMANCE
P0501 VEHICLE SPEED SENSOR CIRCUIT
P0567 CRUISE RESUME CIRCUIT
P0568 CRUISE SET CIRCUIT
P0571 CRUISE BRAKE SWITCH CIRCUIT
P0601 PCM MEMORY
P0602 PCM NOT PROGRAMMED
P0606 PCM INTERNAL COMMUNICATION INTERRUPTED
P1125 ACCELERATOR PEDAL POSITION (APP) SYSTEM
P1214 INJECTION TIMING OFFSET ERROR
P1216 FUEL SOLENOID RESPONSE TIME TOO SHORT
P1217 FUEL SOLENOID RESPONSE TIME TOO LONG
P1218 INJECTION PUMP CALIBRATION CIRCUIT
P1621 PCM MEMORY PERFORMANCE
P1627 A/D PERFORMANCE
P1635 PCM 5-VOLT REFERENCE LOW
P1641 MALFUNCTION INDICATOR LIGHT (MIL) CONTROL CIRCUIT
P1654 SERVICE THROTTLE SOON CONTROL CIRCUIT
P1656 WASTEGATE SOLENOID CONTROL CIRCUIT
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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