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P1602

PCM Not Programmed.

  • Dodge
  • Powertrain
  • Manufacturer code
  • High severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
6
AreaComputer and output circuits
02
FaultThe specific fault in that area

What it means

On Dodge vehicles, P1602 means the powertrain control module (PCM) has detected that it is not programmed, so its software or configuration data is missing or invalid. This is typically seen after a PCM replacement or a failed or interrupted reprogramming. The PCM may also have lost its stored data through an internal fault.

Symptoms

  • Engine cranks but will not start, or starts and then stalls
  • Malfunction indicator lamp on
  • Security or immobiliser warning light on or flashing
  • Poor running, limp mode or reduced performance if the engine does run
  • Other modules reporting loss of communication with the PCM

Possible causes

  • Replacement PCM fitted that has not been programmed or configured for the vehiclelikely
  • Interrupted or failed software update or reprogramming, for example due to low battery voltage during the processlikely
  • Internal PCM fault corrupting or losing its stored programme or calibration datapossible
  • Unstable power or earth supply to the PCM causing a memory or programming errorpossible
  • Damaged wiring or connectors on the PCM power, earth or data circuitspossible
  • Incorrect or incompatible PCM fitted for the model, engine or specificationrare

How to diagnose

  1. Read all stored and pending codes and any freeze frame data, and note whether P1602 is current or historic
  2. Ask about recent work: PCM replacement, software updates, battery disconnection or flat battery
  3. Check battery condition and charging voltage, as low voltage can corrupt or interrupt programming
  4. Inspect the PCM connectors, power feeds, fuses and earths for damage, corrosion or looseness
  5. Check for other codes, especially communication, immobiliser or key-related ones, and see if other modules can communicate with the PCM
  6. Confirm the PCM part number and software level match the vehicle specification; the correct procedure depends on model, engine and year
  7. Attempt a proper reprogramming of the PCM with the correct software for the vehicle, with a stable power supply connected, and see whether the code returns

How to fix

  • Programme the PCM with the correct, current manufacturer software for the vehicle, including any required immobiliser or key synchronisation
  • Repeat a failed update using a stable battery supply and the correct procedure
  • Repair any damaged wiring, connectors, power feeds or earths found on the PCM circuits
  • Replace the PCM if it cannot be programmed or keeps losing its data, then programme it to the vehicle
  • Fit the correct PCM for the model and specification if the wrong unit was installed

Can I keep driving?

High severity

Do not rely on driving the car, as it may not start or may stall without warning. If it does run, limit use to getting it to a workshop for reprogramming.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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