P102D

Code

DACIA P — Powertrain

Cruise control system - circuit malfunction

Brand: DACIA

Type: P — Powertrain

Views: UK: 19 EN: 29 RU: 23

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or corroded wiring or connector in cruise control circuit
Loose or poor ground or 12 V supply to cruise control module or switches
Faulty cruise control switch/stalk or steering wheel controls
Faulty brake or clutch switch (interrupts cruise enable circuit)
Blown fuse or poor fuse connection for cruise/control module power
Faulty cruise control actuator or vacuum/electrical servo (where fitted)

Symptoms

Cruise control unavailable; cannot engage or hold set speed
Cruise system warning or message on instrument cluster
Intermittent operation of cruise control
Immediate cancellation of cruise when selecting ON/SET
Possible related warnings if communication faults are present

What to check

Read freeze frame and live data with a suitable scan tool; note status of cruise enable, brake/clutch switch and related faults
Check fuses related to cruise control and vehicle control modules
Visually inspect wiring and connectors to cruise switch, brake/clutch switch and cruise module for damage or corrosion
Verify operation of brake and clutch switches (observe status in live data while actuating)
Confirm module power and ground voltages at connector with key on
Check for CAN/communication faults that may affect cruise control

Signal parameters

Cruise switch/stalk: expected closed/open logic change when pressed (0/5 V or 0/ground depending on design)
Brake switch: change in input status when brake pedal pressed (binary 0/1 in live data)
Supply voltage at cruise module: battery voltage (~12 V) with ignition ON
Ground continuity from cruise module ground pin to chassis
Resistance/continuity of wiring between module and switches (ohms)
CAN bus frames: presence of CAN messages and lack of errors (no bus-off)

Diagnostic algorithm

Retrieve freeze-frame and live data with a manufacturer-capable scan tool; note related stored codes and current statuses (cruise enable, brake switch, CAN errors).
Check fuses and relays for the cruise control and related control modules; replace if blown and re-test.
Visually inspect wiring harnesses and connectors at the cruise switch, steering column, brake and clutch switches and cruise module for corrosion, pin damage or poor mating.
Verify power and ground at the cruise control module connector with ignition ON. Repair any power/ground faults before further testing.
Using the scan tool, observe brake and clutch switch states while operating pedals. If switches do not change state, test and replace switch as required.
Test cruise control switch/stalk operation: check continuity or voltage changes when using each switch position; repair or replace if faulty.
Perform continuity/resistance tests on suspect wiring circuits (module-to-switch, module-to-ground). Repair breaks, shorts, or high-resistance connections.
If communication faults are present, check CAN bus wiring and related modules. Repair bus wiring or module faults as required.
If wiring and switches test good, test actuator output (voltage/PWM) from the module while commanding cruise; if no command present, consider module fault or further ECU-level diagnosis.
After repairs, clear trouble codes and road-test to confirm the cruise control operates correctly and the code does not return.

Likely causes

Open/short in wiring or connector to the cruise control switch or module
Faulty brake/clutch switch preventing enable signal
Loss of power or ground to the cruise control module (fuse, connector)
Faulty cruise control switch/stalk

Fault status

⚠️ Status

Cruise control system circuit malfunction detected — electrical fault or communication issue preventing normal cruise control operation. Inspect wiring, switches, power/ground and module communication.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P102D — Cruise control system - circuit malfunction