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Hi Guys,

I have a 2015 Cruze 1.8l with 43,000miles. About a month ago my car starting throwing codes... All these appeared at the same time.

P2301 - Ignition Coil A Primary Control Circuit High
P2270 - O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2
P0351 - Ignition Coil A Primary Control Circuit/Open
P0137 - O2 Sensor Circuit Low Voltage Bank 1 Sensor 2

1st time at the dealership they said bad 02 sensor causing all 4 codes. pay then 300 dollars to replace sensor, faults come back 10 miles down the road.

2nd time at the dealership they said bad coolant hose leaking onto recently replaced O2 sensor has caused the sensor to fail again. 400 dollars. This has cleared the 02 codes, but 10 miles down the road Ignition Coil codes present themselves again.

3rd time at the dealership
they said the bad ignition coil, 400 dollars, replaced coil. drive 10 miles down the road and codes come back.

Since all these codes presented themselves at the same time, I figured they were all directly related. I was surprised after the second time I took my car to the dealership they were able to clear the O2 sensor related codes but not the Ignition coil codes. It seems unlikely that the engine coil, coolant hose and oxygen sensor all failed at exactly the same time.

This morning I did an experiment with my OBD II scanner. I disconnected the upstream O2 sensor (they never performed any work on this part), as expected my car threw multiple codes warning me of an open circuit. I then reconnected the upstream O2 sensor and disconnected downstream sensor (the sensor they replaced twice so far). I was expecting to see similar codes ring up. However my car does not recognize that the Downstream sensor is disconnected...

I am a little perplexed by this, I have a feeling that they have not fixed anything with the car and have simply disabled the codes inside the OBD software pertaining to the O2 sensor 2 so that it appears they have made repairs. I believe all the original codes are related and that interchanging o2 sensors and coils were never going to fix the issue, and that they have been charging me all the way.

Any advice on how I should approach the dealership about this? the likelyhood that my suspicions are correct?

Super Moderator
7,484 Posts
Welcome Aboard!(y)

If you can read and tell a socket from a wrench, start fixing this stuff yourself. We have many How-To posts on many of the common issues.

Causes for this code, P2301, may include:
Bad relay or blown fuse (fusible link)
PCM failure
Open or shorted wiring or wiring connectors (wildlife damage)
Defective ignition coil
Faulty camshaft or crankshaft sensor or wiring
Read more at: P2301 Ignition Coil A Primary Control Circuit High

The causes for this DTC, P2270, may include:
Exhaust leak near O2 sensor
Contaminated or failed HO2S2 (Sensor 2)
HO2S2 wiring/circuit problem
Loose installation of HO2S2
Fuel pressure incorrect
Faulty fuel injector
Engine coolant leak
Faulty purge solenoid valve
PCM has failed
Read more at: P2270 O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2

Potential causes of a P0351 code include:
Short to voltage or ground on COP driver circuit
Open on COP driver circuit
Loose connection at coil or broken connector locks
Bad Coil (COP)
Faulty Powertrain Control Module (PCM)
Read more at: DTC P0351 Ignition Coil A Primary/Secondary Circuit Malfunction

A code P0137 may mean that one or more of the following has happened:
Faulty o2 sensor
Exhaust leak near the rear sensor
Plugged catalyst
Short to voltage on O2 signal circuit
High resistance or open on O2 signal circuit
Engine running very rich or lean
Engine misfire condition
Fuel pressure very high or low - fuel pump or pressure regulator
Read more at: OBD-II Trouble Code: P0137 Oxygen O2 Sensor Low Voltage (Bank1, Sensor2)
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