OBD Guide
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P1674

Control Module Software Corrupted

P1674 is an OBD-II diagnostic trouble code meaning: Control Module Software Corrupted . Common causes: failure to update ecu software, control unit memory damaged. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Unstable engine operation
  • Check Engine Light Illuminates
  • Power Loss
  • Problems starting the engine
  • Malfunctions of other vehicle systems

Causes

  • Failure to update ECU software
  • Control unit memory damaged
  • Short circuit in the ECU power supply circuit
  • Electrical interference
  • Physical damage to the control unit

How to Fix

  1. Check power supply and grounding of the ECU
  2. Read error codes and freeze frame data
  3. Try to reset the error and reboot the system
  4. If necessary, reflash the ECU
  5. As a last resort, replace the control unit

Related codes

P0601P0602P0606

Error P1674 by Vehicle Brand

BuickCadillacChevroletGMGMCOldsmobileSaturn

FAQ

What does the P1674 code mean?

P1674 is an OBD-II diagnostic trouble code that indicates: Control Module Software Corrupted

What causes a P1674 error code?

The most common causes of P1674 include: Failure to update ECU software; Control unit memory damaged; Short circuit in the ECU power supply circuit; Electrical interference.

How do I fix a P1674 diagnostic trouble code?

To fix P1674: Check power supply and grounding of the ECU. Read error codes and freeze frame data. Try to reset the error and reboot the system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1674?

Do not drive — repair immediately

How much does it cost to fix P1674?

The estimated repair cost for P1674 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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