Diagnostic guide for P0606

Diagnostic Guide for P0606 - Engine Control Module Processor Failure

The P0606 code indicates a potential failure in the Engine Control Module (ECM) due to discrepancies between its main and sub CPUs. The goal of this diagnostic guide is to systematically identify the root cause of the issue, ensuring the ECM and its connections are functioning correctly.

✓

Difficulty

Intermediate

⏱

Estimated Time

30-60 Minutes

Estimated Diagnostic Cost

$0-$100

Typical shop charge to perform this diagnostic process. Repair parts and labor are not included.

⚙

Tools Needed

OBDII scanner, multimeter, wiring diagram, basic hand tools

Safety Notes

Ensure the vehicle is in park or neutral with the parking brake engaged. Be cautious of hot engine components and moving parts during inspection.

Step 1

Check for Additional Codes

Instruction Using an OBDII scanner, check for any additional trouble codes stored in the ECM.

Expected result A list of trouble codes, including P0606.

If Pass If P0606 is the only code, proceed to the next step. If other codes are present, address them first as they may relate to the ECM issue.

If Fail If no codes are found, verify the scanner's connection and functionality. Reconnect and scan again.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 2

Inspect ECM Connections

Instruction Visually inspect the ECM connectors and wiring for any signs of damage, corrosion, or loose connections.

Expected result No visible damage or corrosion on connectors and wiring.

If Pass If connections are secure and undamaged, proceed to test the ECM power and ground circuits.

If Fail If damage or corrosion is found, repair or replace the affected connectors or wiring.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 3

Test Power and Ground to ECM

Instruction Using a multimeter, check the power and ground circuits at the ECM connector according to the wiring diagram.

Expected result Proper voltage readings (typically around 12V) on power circuits and continuity on ground circuits.

If Pass If power and ground are present, the ECM may be faulty. Proceed to the next step.

If Fail If power or ground is missing, trace the circuit back to the battery and check for shorts or opens.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 4

Perform ECM Self-Test

Instruction If available, perform a self-test of the ECM using the OBDII scanner to check for internal faults.

Expected result The self-test completes without errors.

If Pass If the self-test is successful, the ECM is likely functioning correctly. Consider further diagnostics for related systems.

If Fail If the self-test indicates faults, the ECM may need to be replaced.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 5

Check for Technical Service Bulletins (TSBs)

Instruction Research any TSBs related to the P0606 code for the specific vehicle make and model.

Expected result Identification of any relevant TSBs that may provide additional diagnostic or repair guidance.

If Pass If TSBs are found, follow the recommended procedures for addressing the issue.

If Fail If no TSBs are found, document the findings and consider consulting with a professional technician.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.