故障码索引 · medium
P1794
Battery voltage circuit malfunction (TCM permanent supply)
Battery voltage circuit malfunction (TCM permanent supply)
Applies to: All X-TYPE variants, 2001-2009 (saloon & estate) · Confidence: Manufacturer code list + field-verified causes
Common causes
- Open or high-resistance permanent B+ feed to the TCM
- Weak battery
- Bad ground
Quick checks
- Scan access: Jaguar-specific: WDS/IDS or a Jaguar-capable scan tool
- Prefer official/field-verified path before guessing sensors
Typical fixes
- Check the TCM permanent feed and fuse
- Load-test the battery
- Clean grounds