C1135
CAN Communication Line Or TCM
C1135 is an OBD-II diagnostic trouble code meaning: CAN Communication Line Or TCM. Common causes: open or short circuit in the can bus, oxidation of contacts in can network connectors. Estimated repair cost: $56–333.
Symptoms
- Automatic transmission switches to emergency mode (fixation of one gear)
- Unstable gear shifts
- No speedometer/tachometer readings
- Check Engine Light Is On
- Reduced engine power
Causes
- Open or short circuit in the CAN bus
- Oxidation of contacts in CAN network connectors
- TCM malfunction
- Wiring harness damage
- TCM power or ground problems
- Software glitches (requires flashing)
How to Fix
- Check the integrity of the CAN bus (60 Ohm resistance between CAN-H and CAN-L)
- Inspect the connectors and contacts of the TCM and other modules for corrosion.
- Check TCM power and ground
- Read extended fault codes with scanner
- If necessary, replace the TCM or repair damaged wiring.
- Perform transmission adaptation after repair
Related codes
FAQ
What does the C1135 code mean?
C1135 is an OBD-II diagnostic trouble code that indicates: CAN Communication Line Or TCM
What causes a C1135 error code?
The most common causes of C1135 include: Open or short circuit in the CAN bus; Oxidation of contacts in CAN network connectors; TCM malfunction; Wiring harness damage.
How do I fix a C1135 diagnostic trouble code?
To fix C1135: Check the integrity of the CAN bus (60 Ohm resistance between CAN-H and CAN-L). Inspect the connectors and contacts of the TCM and other modules for corrosion.. Check TCM power and ground. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1135?
Limited driving only, diagnose soon
How much does it cost to fix C1135?
The estimated repair cost for C1135 is $56–333. Actual cost depends on your vehicle, location, and labor rates.
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