OBD Guide
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P1680

Control Module Not Programmed

P1680 is an OBD-II diagnostic trouble code meaning: Control Module Not Programmed. Common causes: replacing the ecu without further programming, failure when updating ecu firmware. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Engine won't start
  • Check Engine Light Is On
  • Loss of engine power
  • Incorrect transmission operation
  • Malfunctions of the car's electronic systems

Causes

  • Replacing the ECU without further programming
  • Failure when updating ECU firmware
  • Control module power problems
  • ECU memory damage
  • Software incompatibility

How to Fix

  1. Check battery voltage and ECU power supply circuit
  2. Read all error codes using a diagnostic scanner
  3. Try to reflash the ECU using dealer software
  4. If necessary, replace the control module
  5. Perform adaptation and calibration of systems after programming

Related codes

P1681P1682P1683

Error P1680 by Vehicle Brand

BuickCadillacChevroletChryslerDodgeGMGMCJeepMazdaOldsmobilePlymouthPontiacSaturn

FAQ

What does the P1680 code mean?

P1680 is an OBD-II diagnostic trouble code that indicates: Control Module Not Programmed

What causes a P1680 error code?

The most common causes of P1680 include: Replacing the ECU without further programming; Failure when updating ECU firmware; Control module power problems; ECU memory damage.

How do I fix a P1680 diagnostic trouble code?

To fix P1680: Check battery voltage and ECU power supply circuit. Read all error codes using a diagnostic scanner. Try to reflash the ECU using dealer software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1680?

Do not drive — repair immediately

How much does it cost to fix P1680?

The estimated repair cost for P1680 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat