5.9L Cummins 24-Valve (VP44) Diagnostics

Dodge Ram 2500/3500, 1998.5-2002 — the 24-valve ISB with the Bosch VP44 electronic injection pump, fixed-geometry turbo, and no emissions system. Lift-pump, APPS/pedal, VP44 and sensor faults dominate.

Common symptoms

Engine Stalls or Dies While Driving — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9 Cummins 24-Valve (VP44) 1998.5–2002 that stalls or dies while driving.
Hard Start or No Start — 5.9 Cummins 24-Valve (VP44) Diagnostic guide for hard start or no start on 5.9 Cummins 24-Valve VP44 (1998.5–2002).
Loss of Power or Dead Pedal — 5.9 Cummins 24-Valve (VP44) The 5.9L Cummins 24-Valve (VP44) can lose throttle response or power under load. The driver feels a dead pedal, hesitation, or a sudden loss of power, often…
Surging or Bucking — 5.9 Cummins 24-Valve (VP44) The engine speed rises and falls at idle or under light load, or the truck jerks as if fuel is being cut in and out.
White Smoke or Rough Running on Cold Start — 5.9 Cummins 24-Valve (VP44) Diagnostic guide for white smoke and rough running on cold start on the 5.9L Cummins 24-valve VP44 platform.

P0237 — Turbocharger/Supercharger Boost Sensor A Circuit Low — 5.9 Cummins 24-Valve (VP44) Diagnostic guide for P0237 on 5.9 Cummins 24-Valve VP44 (1998.5–2002).
P0251 — Injection Pump Fuel Metering Control A Malfunction (Cam/Rotor/Injector) — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9 Cummins 24-Valve VP44 (1998.5–2002) when P0251 is set. Focuses on how to diagnose the fault without step-by-step repair of…
P0370 — Timing Reference High Resolution Signal A — 5.9 Cummins 24-Valve (VP44) Diagnostic guide for P0370 on 5.9 Cummins 24-Valve VP44 (1998.5–2002).
P1689 — No Communication Between ECM and Injection Pump Module — 5.9 Cummins 24-Valve (VP44) The ECM has lost communication with the VP44 pump's controller. On the 5.9L 24-valve this commonly causes a no-start or stall and points to the ECM-to-pump…
P1690 — Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9 Cummins 24-Valve VP44 (1998.5-2002) when P1690 is set. Focus on signal disagreement between the VP44 internal speed signal and the…
P1691 — Fuel Injection Pump Controller Calibration Error — 5.9 Cummins 24-Valve (VP44) P1691 is a Chrysler-enhanced code for the 5.9L Cummins 24-valve VP44. It indicates the VP44 pump controller reports a calibration error, often after a pump…
P0238 — Turbocharger/Supercharger Boost Sensor A Circuit High — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for P0238 on 5.9L Cummins 24-Valve VP44 (1998.5-2002).
P1688 — Internal Fuel Injection Pump Controller Failure — 5.9 Cummins 24-Valve (VP44) P1688 on a 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins 24-valve (VP44) indicates the ECM has detected an internal failure of the VP44 pump-mounted controller.…
P0107 — Manifold Absolute Pressure/Barometric Pressure Circuit Low — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9L Cummins 24-Valve (VP44) 1998.5–2002.
P0117 — Engine Coolant Temperature Circuit Low Input — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9L Cummins 24-Valve (VP44) 1998.5–2002. Focus on diagnosing the ECT circuit low-input condition without step-by-step repair of…
P0122 — Throttle/Pedal Position Sensor/Switch A Circuit Low Input — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9L Cummins 24-Valve VP44 (1998.5–2002) P0122. Focus on APPS circuit low voltage detection and related drivability symptoms. Do not…
P0123 — Throttle/Pedal Position Sensor/Switch A Circuit High Input — 5.9 Cummins 24-Valve (VP44) P0123 on the 5.9L Cummins 24-Valve VP44 means the ECM is seeing an APPS voltage above the expected range. On this platform the accelerator pedal position…
P0128 — Coolant Thermostat Below Regulating Temperature — 5.9 Cummins 24-Valve (VP44) Engine coolant does not reach the expected operating temperature in the expected time.
P0182 — Fuel Temperature Sensor A Circuit Low — 5.9 Cummins 24-Valve (VP44) Fuel Temperature Sensor A Circuit Low
P0216 — Injection Timing Control Circuit Malfunction — 5.9 Cummins 24-Valve (VP44) P0216 on the 5.9L Cummins 24-valve VP44 means the ECM has detected an issue with the injection timing control circuit or its performance. On this platform the…
P0230 — Fuel Pump Primary Circuit — 5.9 Cummins 24-Valve (VP44) The engine control module has detected an electrical fault in the primary control circuit of the fuel pump on a 5.9L Cummins 24-Valve (VP44) 1998.5–2002 Dodge…
P0234 — Turbocharger/Supercharger Overboost Condition — 5.9 Cummins 24-Valve (VP44) P0234 on the 5.9L Cummins 24-Valve VP44 means the ECM has seen boost pressure above the allowed limit for current conditions. On this platform the turbo is a…
P0336 — Crankshaft Position Sensor A Circuit Range/Performance — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9L Cummins 24-Valve VP44 (1998.5–2002) when ECM reports crankshaft position sensor signal erratic/out of range.
P0341 — Camshaft Position Sensor A Circuit Range/Performance — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for 5.9L Cummins 24-Valve (VP44) 1998.5–2002.
P0380 — Glow Plug/Heater Circuit Malfunction — 5.9 Cummins 24-Valve (VP44) P0380 is a generic OBD-II code for a glow plug/heater circuit electrical fault. On the 5.9L Cummins 24-Valve VP44 platform the engine uses an intake-air grid…
P0480 — Cooling Fan 1 Control Circuit/Open (Low Speed Fan Relay) — 5.9 Cummins 24-Valve (VP44) The engine control module has detected an electrical fault in the control circuit for cooling fan 1.
P0500 — Vehicle Speed Sensor A Malfunction — 5.9 Cummins 24-Valve (VP44) Diagnostic reference for P0500 on 5.9L Cummins 24-Valve (VP44) 1998.5–2002.
P0602 — Control Module Programming Error — 5.9 Cummins 24-Valve (VP44) P0602 means the PCM/ECU has detected an internal programming error or corruption on the 5.9L Cummins 24-Valve VP44 platform.
P0605 — Internal Control Module Read Only Memory (ROM) Error — 5.9 Cummins 24-Valve (VP44) P0605 on a 5.9L Cummins 24-Valve (VP44) means the PCM/ECU has detected an internal fault in its non-volatile memory (ROM) that prevents reliable operation of…
P0606 — Control Module Processor Performance — 5.9 Cummins 24-Valve (VP44) P0606 on the 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins 24-valve (VP44) means the Powertrain Control Module (PCM/ECU) has detected an internal processor…
P1693 — DTC Detected in Companion Module — 5.9 Cummins 24-Valve (VP44) P1693 is a companion/secondary code on the 5.9L Cummins 24-valve VP44 platform. It indicates the PCM has stored another fault in a separate module and is…