P06E5

Code

Generic P — Powertrain

Glow Plug Control Module 1 Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 28 EN: 59 RU: 25

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Causes

Failure of Glow Plug Control Module 1 (internal electronics)
Open or shorted wiring between ECU, module and glow plugs
Weak or low battery voltage or poor battery connections
Blown fuse or faulty main relay for glow system
Corroded or poor connector pins at module or glow plugs
Faulty individual glow plugs causing abnormal current draw

Symptoms

Glow-plug/Wait-to-Start or general diesel preheat warning lamp illuminated
Hard starting or extended crank times, especially when cold
Rough cold idle or misfires on start
Reduced engine performance until engine warms
Multiple related codes for glow plugs or glow control
Intermittent starting problems or no glow system operation

What to check

Read freeze-frame and complete DTC list with a capable scan tool; capture live data for glow control commands/status
Verify battery voltage (engine off and during cranking); ensure >11.5–12.0 V for accurate testing
Visually inspect fuses, relays and connectors for corrosion, loose pins or water intrusion
Check continuity and resistance of harness between module and glow plugs, and between module and ECU
Measure individual glow plug resistance to identify shorted or open plugs
Check module power and ground at the connector with multimeter for proper supply and solid ground

Signal parameters

Module supply: nominal battery voltage (approx. 12–14 V) at module power pin when ignition ON
Ground: near 0 V with good continuity (
Control command from ECU: digital request on CAN or command/enable signal (voltage or switched ground depending on design)
Output to glow plugs: pulsed or switched power with variable duty cycle during preheat — expected to show switched 12 V pulses when active
Glow plug current: individual plugs commonly draw several amps each when cold (typical range ~4–12 A each depending on design); total module current will be sum of active glow plugs
Abnormal conditions: either near-zero current when commanded (open circuit) or excessive current above expected per-plug values (short or failed plug)

Diagnostic algorithm

Confirm the P06E5 is current and note freeze-frame and related codes. Do not clear codes yet.
Check and record battery voltage. Charge or replace battery if voltage is low; retest.
Inspect fuses and relays for the glow/heater circuit. Replace any blown fuse and test relay operation.
Visually inspect module connectors, harnesses and glow plug connectors for corrosion, loose pins, heat damage or water ingress. Repair as needed.
With ignition ON (no cranking), measure module supply voltage at the module power pin(s). Verify good ground at module ground pin(s).
Using a scan tool, command the glow system (if tool supports) and observe module status, commanded duty cycle, and any reported errors. If module does not respond, check communication lines (CAN) or command wiring.
While commanding the glow system, measure voltage pulses at module outputs to glow plugs. If outputs present correct pulses but engine still faults, measure current draw per glow plug or across the module output. Compare to expected values.
Test each individual glow plug resistance at cold. Replace any plugs with open circuit or significantly out-of-spec low/high resistance. Re-measure current behavior after replacing faulty plugs.
Perform a harness continuity check between module outputs and glow plugs; repair any short/open circuits.
If power, ground, command signal and glow plugs are good but module outputs are incorrect or intermittent, consider replacing the Glow Plug Control Module 1. Follow OEM procedures for programming/configuration if required.
After repair, clear codes, perform a preheat command and repeat live-data checks. Confirm no return of P06E5 after road test or several start cycles in relevant conditions.