C1120 Trouble Code

View C1120 obd/2 error code description and symptoms. C1120 engine photo

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

Circuit High Input codes like C1120 are mostly caused by defective alternators that develop excessive voltages, although there may be other causes as well, such as short circuits that 'leak' current into a particular system from other, unrelated systems that work on higher voltages. Note that in the case of short circuits that leak power into a control circuit, there is likely to be other, seemingly unrelated trouble codes present along with the code(s) being investigated. Diagnosing a 'high input' code will always involve a thorough testing of the charging system as a first step, followed by measures to isolate the system from all other possible sources of power during resistance, continuity, and reference voltage tests.

Difficulty Level (Easy)
Level
Repair Time (45 Min.)
Time
Cost Prediction : $ 80-120

C1120 Error Code Repair Process :

If your left rear sensor circuit short to vbat check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system C1120 and engine control unit are in charge of monitoring a bunch of different left rear sensor circuit short to vbat, and if they get a reading that's a little out of whack, up pops the check engine light.

Wrench Tool C1120 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C1120

A common cause of code C1120 is the failure of Left Rear Sensor Circuit Short to Vbat, but there are several other possible causes as well, such as ;

C1120 code for all cars

You can view according C1120 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C1120 Temperino Touring +C1120 Renault Megan +C1120 Daewoo Mantica +C1120 Brutsch Bussard +C1120 Mini Mk

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