OBD Guide
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U1252

Invalid Or Missing Data For Class A Functions

U1252 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Class A Functions. Common causes: damage to the can bus, open or short circuit in wiring. Estimated repair cost: $17–111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Some electronic systems do not work (for example, power windows)
  • Flickering or failure of interior lights
  • Problems with central locking
  • Check Engine light comes on
  • Errors in the operation of other electronic systems

Causes

  • Damage to the CAN bus
  • Open or short circuit in wiring
  • Failure of one of the class A modules
  • Poor contact in connectors
  • Problems with module power supply

How to Fix

  1. Check the integrity of the CAN bus
  2. Inspect the wiring harness for damage
  3. Check connections and connectors of modules
  4. Scan all modules for errors
  5. If necessary, replace the faulty module

Related codes

U1251U1253U1250

FAQ

What does the U1252 code mean?

U1252 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Class A Functions

What causes a U1252 error code?

The most common causes of U1252 include: Damage to the CAN bus; Open or short circuit in wiring; Failure of one of the class A modules; Poor contact in connectors.

How do I fix a U1252 diagnostic trouble code?

To fix U1252: Check the integrity of the CAN bus. Inspect the wiring harness for damage. Check connections and connectors of modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1252?

Yes, but get it checked soon

How much does it cost to fix U1252?

The estimated repair cost for U1252 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat