Fault in the brake control unit (ABS/ESP) or its wheel speed signals sending implausible data; Faulty or contaminated wheel speed sensor, damaged sensor wiring or tone ring; CAN bus wiring fault such as chafing, open circuit, short or corroded connector; Low battery voltage or poor earths and power supplies causing corrupt bus messages; Another control unit on the network faulty or loading the bus; Outdated or faulty control unit software or incorrect coding after a repair; Internal fault in the receiving control unit (engine or transmission).

P1853

CAN Bus Unplausible Message From Brake Control.

Volkswagen
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
8: AreaTransmission
53: FaultThe specific fault in that area

What it means

On Volkswagen, P1853 means a control unit (typically the engine or transmission control unit) received a CAN bus message from the brake control unit (ABS/ESP) that failed its plausibility check. The message was missing, corrupt or its values did not agree with other data such as wheel or vehicle speed. The exact unit that sets the code and the signals checked vary by model and gearbox.

Symptoms

Engine management or gearbox warning light on
ABS, ESP or traction control warning lights on at the same time
Gearbox stuck in a gear, limp mode or harsh or erratic shifts
Cruise control or speed limiter not working
Reduced engine power or traction control intervening oddly
Speedometer or other dash readings behaving erratically

Possible causes

Fault in the brake control unit (ABS/ESP) or its wheel speed signals sending implausible datalikely
Faulty or contaminated wheel speed sensor, damaged sensor wiring or tone ringlikely
CAN bus wiring fault such as chafing, open circuit, short or corroded connectorpossible
Low battery voltage or poor earths and power supplies causing corrupt bus messagespossible
Another control unit on the network faulty or loading the buspossible
Outdated or faulty control unit software or incorrect coding after a repairrare
Internal fault in the receiving control unit (engine or transmission)rare

How to diagnose

Read all fault codes from every control unit and record freeze frame data; note any ABS, ESP, wheel speed or CAN communication codes
Check battery condition and charging voltage, and inspect battery terminals and main earths
Visually inspect wheel speed sensor wiring, connectors and the area around the brake control unit for damage, water or corrosion
Compare live wheel speed values from the brake control unit with vehicle speed and each other on a road test or with the wheels lifted
Check the network topology in the model-specific wiring diagram, then test CAN high and low wiring for continuity, shorts and correct resistance
Check the brake control unit and transmission or engine control unit connectors and supply and earth feeds
Check for available software updates or coding requirements for the affected units against manufacturer data
Clear the codes and retest to see whether P1853 returns, and whether it is intermittent or permanent

How to fix

Repair or replace damaged wheel speed sensors, wiring or tone rings
Repair CAN bus wiring or connector faults, including corrosion and chafed looms
Restore good battery condition and repair poor earths or supply faults
Replace or repair the brake control unit if it is confirmed faulty, then code or adapt it as required
Update control unit software or correct coding where an update or coding error is confirmed
Replace the receiving control unit only after wiring, supplies and the sending unit are proven good

Can I keep driving?

Medium severity

The car may be driveable, but ABS, ESP or gearbox behaviour may be affected, so drive cautiously and have it checked soon. If the brake warning light is on, or the gearbox is in limp mode, limit driving and get it inspected promptly.

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