P0420 Diagnostic Trouble Code Discussion for October 2022
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2009 Chevrolet Silverado 1500 WT 5.3L MIL Lamp on VIN: 2GCEK133X9 P0420: cat system low efficiency. Hello all. this truck has been running flawlessly until a recentlong trip with a light load. customer said it lost power, overheated for a short time and the transmission would short shift going uo through the gears and had no downshift with throttle down.... |
October 06, 2022 | |
| 2009 Chevrolet Silverado 1500 WT 5.3L MIL Lamp on VIN: 2GCEK133X9 P0420: cat system low efficiency. Hello all. this truck has been running flawlessly until a recentlong trip with a light load. customer said it lost power, overheated for a short time and the transmission would short shift going uo through the gears and had no downshift with throttle down.... |
October 07, 2022 |
