Faulty or misadjusted clutch pedal switch B, such as a stuck contact or a switch out of position; Damaged, chafed or corroded wiring to the switch, including a short to voltage; Poor connection at the switch connector, such as corrosion, bent pins or water ingress; Worn or loose pedal bracket, plunger or striker so the switch no longer operates correctly; Fault in the supply or reference voltage circuit shared with the switch; Fault in the engine or transmission control unit input circuit.

P0835

Clutch Pedal Switch B Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
8: AreaTransmission
35: FaultThe specific fault in that area

What it means

P0835 is the generic code for a fault in the clutch pedal switch 'B' circuit, where the voltage is higher than expected. The control unit monitors the signal from the second clutch pedal switch and compares it with the pedal position it expects, or with the other clutch switch where one is fitted. It set the code because it saw a high voltage that did not make sense for the conditions. Which switch is 'B' and how it is used depends on the model and engine.

Symptoms

Engine will not crank, or cranks only with the clutch pedal held at a certain position
Cruise control not working or cancelling unexpectedly
Stop-start system not working
Rough shifts, surging or poor throttle response on take-off or between gears
Engine warning light on
Clutch switch dependent features behaving inconsistently

Possible causes

Faulty or misadjusted clutch pedal switch B, such as a stuck contact or a switch out of positionlikely
Damaged, chafed or corroded wiring to the switch, including a short to voltagelikely
Poor connection at the switch connector, such as corrosion, bent pins or water ingresslikely
Worn or loose pedal bracket, plunger or striker so the switch no longer operates correctlypossible
Fault in the supply or reference voltage circuit shared with the switchpossible
Fault in the engine or transmission control unit input circuitrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, then check for related clutch, brake or cruise control codes
Visually inspect the clutch pedal, switch, plunger and bracket for damage, wear, looseness or contamination
Check the switch connector and nearby wiring for corrosion, water, chafing, bent pins and poor terminal tension
Using live data, watch the clutch switch status as the pedal is pressed and released and check it changes cleanly with no hesitation
Check the switch adjustment against the manufacturer's specification, as the procedure varies by model
Test the switch for continuity and correct operation in both pedal positions using the manufacturer's wiring diagram
Check the signal, supply and earth circuits at the connector for a short to voltage, open circuit or high resistance
If the wiring and switch are sound, check the control unit's supply, earths and input, following the manufacturer's procedure

How to fix

Replace the clutch pedal switch B if it is faulty or will not adjust correctly
Repair or replace damaged wiring, correcting any short to voltage or open circuit
Clean or repair the connector and terminals, and seal against moisture ingress
Repair or replace the pedal bracket, plunger or striker, then adjust the switch to specification
Rectify any supply voltage or earth fault shared with the circuit
Repair or replace the control unit only after all other causes are ruled out, as the manufacturer directs

Can I keep driving?

Medium severity

The car can often still be driven, but it may fail to start or lose cruise control and stop-start, so get it checked soon. If the engine will not start or drives erratically, do not rely on it.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.