P188D Diagnostic Trouble Code

P188D is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P188D diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code P188D is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P188D.

Fortunately, P188D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P188D Trouble Code For Specific Cars

P188D Ferrari 256 Input/Turbine Speed Sensor Circuit No Signal
P188D Chevrolet Astrovette Driver Door Handle Circuit Failure
P188D Simca 1300 Intake Manifold Runner Control (Stuck Closed)
P188D Nissan Skyline Cruise Control On Signal Malfunction
P188D Dodge Royal Ignition Run/Start Circuit Short To Ground
P188D Chevrolet Corsica Driver Side Crash Sensor Internal Fault
P188D Alfa Romeo Concept Accessory Delay Relay Coil Circuit Short To Ground