OBD Guide
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U1612

Lack of Acknowledgment For Primary Id

U1612 is an OBD-II diagnostic trouble code meaning: Lack of Acknowledgment For Primary Id. Common causes: damage to the can bus or wiring harness, malfunction of one of the electronic modules. Estimated repair cost: $17–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Check Engine light comes on
  • There may be malfunctions in various vehicle systems
  • Problems starting the engine
  • Lost connection with some modules
  • Reduced engine performance

Causes

  • Damage to the CAN bus or wiring harness
  • Malfunction of one of the electronic modules
  • Module power problems
  • Corrosion or poor contact in connectors
  • Software glitches

How to Fix

  1. Check the integrity of the CAN bus and wiring harnesses
  2. Diagnose all connected modules for faults
  3. Check the quality of connections and contacts in the connectors
  4. Update module software
  5. Replace the faulty module if necessary

Related codes

U1610U1611U1613

FAQ

What does the U1612 code mean?

U1612 is an OBD-II diagnostic trouble code that indicates: Lack of Acknowledgment For Primary Id

What causes a U1612 error code?

The most common causes of U1612 include: Damage to the CAN bus or wiring harness; Malfunction of one of the electronic modules; Module power problems; Corrosion or poor contact in connectors.

How do I fix a U1612 diagnostic trouble code?

To fix U1612: Check the integrity of the CAN bus and wiring harnesses. Diagnose all connected modules for faults. Check the quality of connections and contacts in the connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1612?

Limited driving only, diagnose soon

How much does it cost to fix U1612?

The estimated repair cost for U1612 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat