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2010 Grand Caravan C121C: P0522, P1128, P0339, P0303, P0300 Fault Codes - Diagnosis & Solutions

Model: 2010 Grand Caravan Fault Code: P0300 Posted: 2014-07-04 17:21

I'm seeking help with a persistent engine issue on my 2010 Grand Caravan SXT (3.3L V6). The vehicle has been running poorly for approximately five months. I've already replaced the following components: - Injector in cylinder 3 - Spark plugs and spark plug wires - Crankshaft position sensor - Coil pack - Front oxygen sensor Current diagnostic trouble codes (DTCs) are: - P0303: Cylinder 3 misfire - P0300: Multiple cylinder misfire - P0339: Crankshaft Position Sensor intermittent fault - P1128: Closed loop fueling not achieved - Bank 1 - P0522: Engine oil pressure sensor circuit low - C121C: Torque request signal denied Despite these replacements, the engine continues to run poorly. I'm looking for insight into what might be causing these recurring codes and whether there's a common root cause among them. Additional details: - Not original owner; owned for two years with consistent performance until five months ago - Vehicle is bone stock (no modifications) - No accidents or flooding history I've checked the system with an OBD2 scanner, but the codes persist. I'm wondering if there's a deeper issue—such as sensor failure, wiring problems, or a mechanical fault—that could be causing multiple misfires and fueling issues simultaneously.

Related fault codes
P0300P0303P0339P0522P1128
Comments (7)
Anonymous 2014-07-05 13:08

The history of the vehicle may provide key context. Could there have been prior electrical issues? For example: was the vehicle under warranty at any point? Any modifications (like remote starters, audio systems, alarms)? Or has it experienced damage such as flooding or a collision? These factors could influence current fault behavior.

Anonymous 2014-07-05 20:47

No original warranty. I'm not the first owner but have owned this vehicle for two years with stable performance until about five months ago. The van is completely stock—no modifications, no accidents, and no exposure to water damage or impact.

Anonymous 2014-07-05 21:49

C121C: Torque request signal denied P0339: Crankshaft Position Sensor intermittent fault P1128: Closed loop fueling not achieved — Bank 1 P0522: Engine oil pressure sensor circuit low P0300: Multiple cylinder misfire P0303: Cylinder 3 misfire These codes suggest a potential issue with engine control signals and sensor integrity. The presence of both misfire codes (P0300/P0303) and crankshaft sensor fault (P0339) points to possible electrical or mechanical problems in the ignition system or engine timing. P1128 indicates fuel system issues, possibly due to incorrect air-fuel ratio or faulty sensors. P0522 suggests a low oil pressure reading—this could be critical and may impact engine performance and longevity. I’ll investigate further if time permits. Could any of the listed components (like wiring harnesses) have been affected by age or environmental exposure? Any modifications such as remote starters, audio systems, or alarms installed?

Anonymous 2014-07-06 06:52

All equipment is factory-installed. This is a standard 2010 Grand Caravan SXT with the 3.3L engine—no aftermarket parts or modifications.

Anonymous 2014-09-12 09:10

I have a 2010 Grand Caravan SXT. The malfunction indicator light came on and stayed illuminated for about 24 hours before turning off. If it comes back, what should I do? Should I reset the system or take it to a mechanic immediately?

Anonymous 2014-09-12 11:59

It's recommended to have the vehicle scanned with an OBD2 scanner and review its service history—this is often free at dealerships. Posting all current codes helps identify patterns and potential root causes.

Anonymous 2014-09-17 08:36

I hope you don’t have the same issue I’m experiencing on my 2010 Grand Caravan. The symptoms are very similar—misfires, check engine light, and persistent codes after multiple repairs. It’s frustrating to see this recurring in the same model.