OBD Guide
ENFRDEESPT

U1156

Invalid Or Missing Data For Digital Signal Processing

U1156 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Digital Signal Processing. Common causes: damage to the can bus, open or short circuit in wiring harness. Estimated repair cost: $17–111.

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

Symptoms

  • Unstable engine operation
  • Periodic shutdown of vehicle systems
  • Malfunction indicator light comes on
  • Infotainment system malfunctions
  • Lost connection with diagnostic equipment

Causes

  • Damage to the CAN bus
  • Open or short circuit in wiring harness
  • Malfunction of one of the electronic modules
  • Problems with module power supply
  • Software glitches in the system

How to Fix

  1. Check the integrity of the CAN bus
  2. Diagnose the condition of the wiring harness
  3. Check power supply of all connected modules
  4. Update module software
  5. Replace the faulty module if necessary

Related codes

U1155U1157U1158

FAQ

What does the U1156 code mean?

U1156 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Digital Signal Processing

What causes a U1156 error code?

The most common causes of U1156 include: Damage to the CAN bus; Open or short circuit in wiring harness; Malfunction of one of the electronic modules; Problems with module power supply.

How do I fix a U1156 diagnostic trouble code?

To fix U1156: Check the integrity of the CAN bus. Diagnose the condition of the wiring harness. Check power supply of all connected modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1156?

Yes, but get it checked soon

How much does it cost to fix U1156?

The estimated repair cost for U1156 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat