Damaged or chafed CAN bus wiring between modules, especially at harness flex points or near heat sources; Corroded or loose connector pins at any module on the CAN network; A faulty control module internally shorting the CAN lines; Water ingress into a module connector or harness, common in Jaguar footwell and trunk areas; Failed termination resistor inside a module, causing incorrect bus voltage levels; Aftermarket accessories or poor previous repairs tapping into the CAN wiring; Low battery voltage or a failing charging system causing modules to drop offline intermittently

DTC codes / Jaguar codes / P1795

P1795 · JaguarInconsistent CAN Level

Q: What does code P1795 mean?

Inconsistent CAN Level. P1795 on a Jaguar means the Controller Area Network (CAN) bus is reporting inconsistent voltage levels between the two data lines, so the modules cannot reliably exchange messages. The computer has detected that the differential signal on the CAN bus is outside the expected range, often because one module or a wiring fault is pulling a line high or low.

P1795 on a Jaguar means the Controller Area Network (CAN) bus is reporting inconsistent voltage levels between the two data lines, so the modules cannot reliably exchange messages. The computer has detected that the differential signal on the CAN bus is outside the expected range, often because one module or a wiring fault is pulling a line high or low.

SystemPowertrain

Code typeJaguar specific

SeverityHigh

Fix difficultyProfessional

AreaTransmission

Symptoms you may notice

Multiple warning lights on the instrument cluster, often including transmission, ABS, and stability control
Intermittent or complete loss of communication with one or more control modules
Erratic transmission shifting or the gearbox entering limp mode
Engine may crank but not start, or start and run poorly due to missing module data
Often no symptoms besides the warning light if the fault is intermittent
Non-starting condition if the CAN bus is shorted and the immobilizer cannot communicate

Common causes, most likely first

Damaged or chafed CAN bus wiring between modules, especially at harness flex points or near heat sources
Corroded or loose connector pins at any module on the CAN network
A faulty control module internally shorting the CAN lines
Water ingress into a module connector or harness, common in Jaguar footwell and trunk areas
Failed termination resistor inside a module, causing incorrect bus voltage levels
Aftermarket accessories or poor previous repairs tapping into the CAN wiring
Low battery voltage or a failing charging system causing modules to drop offline intermittently

How to diagnose and fix it

Connect a scan tool and read all module fault codes to identify which modules are offline or reporting CAN faults
Measure battery voltage and charging system output; low voltage can cause spurious CAN faults
Inspect the CAN bus wiring and connectors at each module for corrosion, damage, or water intrusion
Use an oscilloscope or break-out box to measure CAN High and CAN Low voltages and check for a short to ground or power
Disconnect modules one at a time to see if the bus voltage returns to normal, isolating the faulty module
Repair or replace damaged wiring, pins, or connectors, then clear codes and verify communication with all modules
If a module is internally shorting the bus, replace or reprogram that module as required

Before you replace a control module

A single module with water damage can pull the entire CAN bus down, so always check for water ingress in footwell and trunk modules before condemning any electronics.
Intermittent P1795 codes often trace to a chafed wire in the harness where it passes through the firewall or near the exhaust, not to a failed module.
Low battery voltage from a failing alternator or aged battery can cause modules to drop off the bus and set P1795 without any wiring fault.
Aftermarket alarms, radios, or phone kits tapped into CAN wiring are a frequent cause of inconsistent CAN levels on older Jaguars.
The code does not always mean the CAN bus is dead; a single module with a faulty internal transceiver can set it while the rest of the network works fine.

Can I keep driving with P1795?

Do not drive the vehicle if multiple warning lights are on or the transmission is in limp mode, because loss of CAN communication can affect steering, braking, and shifting. If the code is intermittent and the car drives normally, have it diagnosed promptly and avoid long trips until repaired.

Tools that help

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Guidance is general and written for Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.