U1817
Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion CAN Bus
U1817 is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion CAN Bus. Common causes: open or short circuit in the can bus circuit, damaged connectors or corroded contacts. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- Switching to emergency mode
- Reduced power or hybrid system failure
- Inability to switch driving modes
- Errors in the operation of the regenerative braking system
Causes
- Open or short circuit in the CAN bus circuit
- Damaged connectors or corroded contacts
- Malfunction of the hybrid powertrain control module (HPCM)
- HPCM power supply problems
- Software failures in control modules
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect and clean HPCM connectors
- Check the supply voltage on the HPCM module
- Scan all modules for additional errors
- Replace HPCM if necessary
- Repair only from an authorized dealer
Related codes
FAQ
What does the U1817 code mean?
U1817 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion CAN Bus
What causes a U1817 error code?
The most common causes of U1817 include: Open or short circuit in the CAN bus circuit; Damaged connectors or corroded contacts; Malfunction of the hybrid powertrain control module (HPCM); HPCM power supply problems.
How do I fix a U1817 diagnostic trouble code?
To fix U1817: Check the integrity of the CAN bus wiring. Inspect and clean HPCM connectors. Check the supply voltage on the HPCM module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1817?
Limited driving only, diagnose soon
How much does it cost to fix U1817?
The estimated repair cost for U1817 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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