Holden Caprice dashboard warning lights
🚘 WM/WN series (2006–2017) – all you need to know: from a flickering oil can to a glowing check engine, every symbol tells a story. This guide covers 16 essential warning lights, their root causes, symptoms, advanced diagnostic steps, and realistic repair costs (AUD).
colour code: 🔴 red = stop immediately • 🟡 amber/yellow = schedule inspection • 🟢 green/blue = information
📋 at a glance: 16 key warning lights
| Symbol | Warning light | Common issue | Est. repair cost (AUD) |
|---|---|---|---|
| Check engine | O2 sensor, misfire, evap | $120 – $1,500 | |
| Oil pressure | Low oil, pump failure | $50 – $1,800 | |
| Battery/alternator | Alternator failure, loose belt | $180 – $750 | |
| Brake system | Low fluid, ABS fault | $100 – $1,200 | |
| Airbag (SRS) | Clock spring, crash sensor | $220 – $950 | |
| Coolant temp | Thermostat, coolant leak | $80 – $800 | |
| ABS | Wheel speed sensor | $140 – $600 | |
| Traction control (ESC) | Steering angle sensor, yaw rate | $150 – $700 | |
| TPMS (tyre pressure) | Sensor battery dead, low pressure | $50 – $400 | |
| Power steering | EPS motor, fluid level (hydraulic) | $200 – $1,100 | |
| Transmission temp | Overheating, low fluid | $150 – $2,200 | |
| Low fuel | Running low, sender fault | $0 (fuel) – $450 | |
| Washer fluid low | Empty reservoir, sensor | $5 – $120 | |
| Service vehicle soon | General powertrain or body fault | $100 – $900 | |
| Reduced engine power | Throttle body, pedal sensor | $180 – $1,300 | |
| Suspension control (MRC) | Magnetic ride shock absorber fault | $400 – $2,500 |
* estimates include parts & labour; Holden specialist may vary.
🔎 full details – issue, symptoms, diagnosis, cost
Check engine
- Issue: Faulty O2 sensor, ignition coil, vacuum leak, EVAP, catalytic converter.
- Symptoms: Rough idle, loss of power, stalling, increased fuel consumption.
- Diagnosis: OBD2 scan for codes (P0xxx/P1xxx). Check live data: fuel trims, O2 switching. Smoke test for leaks. Compression test if misfire.
- Repair options: Replace sensor/coil, intake gaskets, evap purge valve.
$120 – $1,500
Oil pressure
- Issue: Low oil level, faulty pressure sender, worn pump, clogged pickup.
- Symptoms: Light flickers at idle, engine ticking, possible overheating.
- Diagnosis: Check dipstick. Mechanical oil pressure gauge to verify. Inspect sender wiring. Listen for bearing noise.
- Repair options: Top up oil, replace sender, oil pump replacement, engine flush if sludged.
$50 – $1,800
Battery/alternator
- Issue: Failing alternator (diodes/regulator), loose serpentine belt, bad battery cell.
- Symptoms: Dim lights, slow crank, flickering interior lights, battery warning light.
- Diagnosis: Multimeter: battery 12.4V+, running 13.8–14.8V. Load test battery. Check belt tension and alternator bearings.
- Repair options: Replace alternator, belt, battery. Check BCM for parasitic drain.
$180 – $750
Brake system
- Issue: Low brake fluid, worn pads, ABS module fault, hydraulic leak.
- Symptoms: Spongy pedal, increased travel, brake noise, red brake light on.
- Diagnosis: Inspect fluid level and colour. Check pad thickness. Scan ABS module for codes. Pressure test system.
- Repair options: Fluid top-up/bleed, pad/sensor replacement, ABS pump/module repair.
$100 – $1,200
Airbag (SRS)
- Issue: Clock spring broken, front/rear crash sensor, seat belt pretensioner, wiring under seats.
- Symptoms: Airbag light stays on, warning message, horn sometimes inoperative.
- Diagnosis: SRS scan tool (cannot use generic OBD2). Check under-seat connectors. Clock spring continuity test.
- Repair options: Replace clock spring, fix wiring, sensor replacement. (Requires professional reset).
$220 – $950
Coolant temperature
- Issue: Low coolant, stuck thermostat, failed radiator fan, water pump leak.
- Symptoms: Temp gauge high, steam from bonnet, heater blows cold.
- Diagnosis: Check coolant level and condition. Verify fan operation. Infrared gun at thermostat housing. Pressure test cooling system.
- Repair options: Coolant flush, thermostat, water pump, fan motor/relay.
$80 – $800
ABS
- Issue: Wheel speed sensor failure, damaged tone ring, ABS pump motor.
- Symptoms: ABS light on, ABS inactive, possible speedometer inaccuracy.
- Diagnosis: Scan for ABS codes. Visually inspect sensor and reluctor ring. Measure resistance/AC voltage while spinning wheel.
- Repair options: Replace sensor, clean or replace tone ring, ABS module rebuild.
$140 – $600
Traction control (ESC)
- Issue: Steering angle sensor uncalibrated, yaw rate sensor fault, brake switch.
- Symptoms: ESC light on, stability system off, sometimes cruise control disabled.
- Diagnosis: Scan ESC module. Perform steering angle sensor calibration (with scan tool). Check wheel speed data.
- Repair options: Sensor calibration, replace yaw sensor, brake switch.
$150 – $700
TPMS
- Issue: Low tyre pressure, dead sensor battery, damaged sensor during tyre change.
- Symptoms: TPMS light on, pressure reading missing for one wheel.
- Diagnosis: Manually check pressures. Use TPMS tool to trigger sensors. Inspect valve stems for damage.
- Repair options: Inflate tyres, replace sensor (battery non-replaceable), reprogram IDs.
$50 – $400
Power steering
- Issue: Low fluid (hydraulic), EPS torque sensor fault (electric), belt slip.
- Symptoms: Heavy steering, whine, intermittent assistance, light on dash.
- Diagnosis: Check fluid level/condition. Scan EPS module for codes. Test battery voltage under load.
- Repair options: Fluid flush, replacement pump/EPS motor, torque sensor.
$200 – $1,100
Transmission temp
- Issue: Low fluid, torque converter clutch slippage, cooler blockage.
- Symptoms: Transmission slipping, burnt smell, temp light on (red/amber).
- Diagnosis: Check fluid level/colour. Scan TCM for codes. Inspect cooler lines for restrictions.
- Repair options: Fluid/filter service, torque converter replacement, rebuild if severe.
$150 – $2,200
Low fuel
- Issue: Simply low fuel, or faulty fuel level sender, gauge cluster issue.
- Symptoms: Amber light on, inaccurate fuel gauge, distance to empty zero.
- Diagnosis: Add fuel – if light goes out, it’s normal. If persists, test sender resistance at tank.
- Repair options: Fill up; replace fuel pump module (includes sender).
$0 – $450
Washer fluid low
- Issue: Empty reservoir, faulty level sensor, wiring short.
- Symptoms: Amber/blue light, message “washer fluid low”.
- Diagnosis: Check fluid level; if full, test sensor continuity and wiring.
- Repair options: Top up fluid; replace sensor if defective.
$5 – $120
Service vehicle soon
- Issue: Generic warning – can be engine, transmission, ABS, or body control module related.
- Symptoms: Light on, often accompanied by a message in DIC.
- Diagnosis: Full system scan (all modules). Check for any pending codes. Inspect battery voltage/connections.
- Repair options: Depends on code – could be as simple as loose gas cap or as complex as BCM replacement.
$100 – $900
Reduced engine power
- Issue: Throttle body failure, accelerator pedal sensor, ECM limiting power.
- Symptoms: Limited RPM, sluggish acceleration, light on, sometimes limp mode.
- Diagnosis: Scan for throttle body codes (P2100 etc.). Check pedal sensor voltage. Inspect throttle body for carbon.
- Repair options: Clean throttle body, replace pedal sensor, throttle body assembly.
$180 – $1,300
Suspension control (MRC)
- Issue: Magnetic ride shock absorber failure, height sensor fault, compressor (if air).
- Symptoms: “Suspension fault” message, rough ride, uneven stance.
- Diagnosis: Suspension module scan. Check shock electrical connectors. Test compressor operation (if equipped).
- Repair options: Replace MRC shock (expensive), height sensor, compressor relay.
$400 – $2,500
🔬 professional diagnosis – step by step
- OBD2 / factory scan tool: Use a bidirectional scanner (Tech2, Autel, or similar) to read all Holden modules – ECM, TCM, ABS, SRS, BCM.
- Visual inspection: Look for fluid leaks, corroded grounds (especially near battery), chafed wires, loose vacuum hoses.
- Multimeter & test light: Check sensor reference voltage (5V), ground continuity, alternator ripple.
- Mechanical gauges: Oil pressure manual gauge, fuel pressure kit, cooling system pressure tester.
- Live data analysis: Monitor O2 sensors, fuel trims, wheel speeds, transmission temps while test driving.
- Component activation: Use bidirectional control to test fans, fuel pump, ABS solenoids, and MRC dampers.
- Oscilloscope (for advanced): Check crank/cam sensors, wheel speed sensor signals, CAN bus integrity.
💰 typical repair cost ranges (parts + labour)
| Component / repair | Low range | High range | Notes |
|---|---|---|---|
| Oil pressure switch | $150 | $280 | Labour intensive on some V8s |
| Alternator replacement | $500 | $850 | Genuine vs aftermarket |
| ABS wheel speed sensor | $200 | $450 | Front easier than rear |
| Clock spring | $300 | $600 | Includes steering wheel removal |
| Thermostat + housing | $320 | $600 | Alloy housing common fail |
| Fuel pump module | $450 | $950 | Requires tank drop |
| MRC shock absorber (one) | $900 | $2,200 | Magnetic ride – expensive |
| TPMS sensor (each) | $150 | $350 | Includes programming |
Labour rates $110–$190 per hour (specialist). Always get a written quote.
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