U1135
Invalid Or Missing Data For Ignition Switch / Starter
U1135 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Ignition Switch / Starter. Common causes: ignition switch malfunction, problems with wiring or connectors. Estimated repair cost: $17–111.
Symptoms
- Difficulty starting the engine
- Floating idle speed
- Check Engine Light Is On
- Lost connection with diagnostic equipment
Causes
- Ignition switch malfunction
- Problems with wiring or connectors
- CAN bus malfunctions
- Engine control module (ECU) malfunction
- Software error in one of the control units
How to Fix
- Check the condition of the ignition switch
- Diagnose the state of the CAN bus
- Inspect the connectors and wiring of the ignition system
- Scan all modules for errors
- If necessary, reflash or replace the control unit
Related codes
FAQ
What does the U1135 code mean?
U1135 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Ignition Switch / Starter
What causes a U1135 error code?
The most common causes of U1135 include: Ignition switch malfunction; Problems with wiring or connectors; CAN bus malfunctions; Engine control module (ECU) malfunction.
How do I fix a U1135 diagnostic trouble code?
To fix U1135: Check the condition of the ignition switch. Diagnose the state of the CAN bus. Inspect the connectors and wiring of the ignition system. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1135?
Do not drive — repair immediately
How much does it cost to fix U1135?
The estimated repair cost for U1135 is $17–111. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat