What are the explanations for the 7 fault codes in diesel heaters?
2 Answers
Here are the explanations for the 7 common fault codes in automotive diesel heaters: Diesel engine fails to start or has difficulty starting: This issue usually occurs when there is a problem with the rail pressure sensor; Insufficient engine power: This fault typically manifests as a maximum speed of only 1500/1600/1700 RPM, mainly caused by substandard fuel quality or excessive water content in the fuel, leading to rust inside the fuel pump; Engine stuck at 1000 RPM: This is generally caused by a faulty throttle pedal; Limp home mode: Fuel quality issues result in the engine's maximum speed being limited to 1500 RPM; Unstable cruise control: The vehicle speed sensor signal is either too strong or too weak; Flasher light remains on: This is usually due to excessive clutch switch travel gap, causing the ECU to report an "NPL signal not credible" error when the clutch is depressed; Sudden engine shutdown during operation: Unstable power supply voltage, either too high or too low, or poor contact in the power harness.
If the diesel heater vehicle displays a fault code, there are seven most common types. For example, P0128 indicates that the coolant temperature is too low, possibly due to a stuck thermostat preventing hot air from coming out. U0100 represents a communication system failure, where the signal between control modules is interrupted, requiring a check for short circuits in the wiring. P0190 refers to low fuel pressure, leading to incomplete combustion affecting heating. B0140 indicates an issue with the air conditioning controller, possibly a faulty computer. P0113 means the intake air temperature is too high, causing poor ventilation. C1500 suggests a broken fan motor, resulting in weak warm air output. P0034 indicates abnormal turbo pressure, indirectly causing engine overheating. When these fault codes appear, it's best not to delay and immediately go to a professional repair shop to decode them with a diagnostic tool. Otherwise, the lack of warm air in winter can be unbearable and may damage other components. With years of experience in car repairs, I've seen too many cases where timely action can save a lot of money and trouble.
