BMW DTC P139D – Timing Reference High Resolution Signal ‘A’ Intermittent/Erratic Pulses during Start
DTC P139D meaning on BMW
DTC P139D on a BMW indicates an issue with the Timing Reference High Resolution Signal ‘A’ Intermittent/Erratic Pulses during Start. This fault code is related to the engine’s timing reference signal, which is crucial for proper engine operation and performance.
BMW DTC P139D symptoms
Symptoms of DTC P139D on a BMW may include rough idling, misfires, difficulty starting the engine, reduced power, and potentially an illuminated check engine light on the dashboard.
BMW DTC P139D causes
The causes of DTC P139D on a BMW can vary, but common reasons include issues with the crankshaft position sensor, camshaft position sensor, wiring/connectors related to the timing reference signal, or a faulty engine control module (ECM).
BMW DTC P139D seriousness
DTC P139D should be taken seriously as it can lead to poor engine performance, reduced fuel efficiency, and potential engine damage if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P139D on BMW
To diagnose DTC P139D on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then perform a visual inspection of the timing reference signal components, test the sensors and wiring for proper operation, and potentially perform signal waveform analysis to pinpoint the issue accurately.
How to fix DTC P139D on BMW
Fixing DTC P139D on a BMW may involve replacing faulty sensors, repairing damaged wiring/connectors, or reprogramming the ECM if necessary. It is crucial to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix and prevent future recurrence of the issue.
How to erase DTC P139D on BMW
Once the underlying issue causing DTC P139D on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. By clearing the fault codes, the check engine light should turn off, indicating that the issue has been addressed successfully.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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