B0770 Diagnostic Trouble Code

B0770 is a kind of OBD-II Diagnostic B-Body 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 B0770 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Dirty air cleaner element Damaged DPF

Repair Processes :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code B0770 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 B0770.

Fortunately, B0770 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0770 Trouble Code For Specific Cars

B0770 Dodge Razor Ignition Run/Start Circuit Open
B0770 Suzuki Sx4 S-cross Mirror Driver Switch Assembly Circuit Short To Ground
B0770 Innocenti Small SCP (J1850) Invalid or Missing Data for Interior Lamps
B0770 Bmw 1800 Camshaft Position Sensor B Circuit Malfunction
B0770 Chrysler Concorde Engine Shutoff Solenoid Malfunction
B0770 Mitsubishi Eclipse Ii Autolamp Delay Circuit Short To Battery
B0770 Alfa Romeo 66 Accelerometer Front Circuit Is Not Sensed