CRM Mitchell1 2021-08-31T22:00:48+00:002013 Chevrolet Express CRM Mitchell1 2021-08-31T22:00:48+00:00
- Test drive – erratic shifting, dash gauges twitching and power loss Used Scan Tool on Vehicle Trouble Codes Found: #P0300 random misfire #P0420 Catalyst system bank 1 #P0430 Catalyst system bank 2 #P0700 TCM #P2099 Post catalyst #P2544 Torque request circuit #U0073 Control module bus #U0101 Lost communication with TCM #U0121 Lost communication with ABS system Appears to have lost communication with computer Check battery and charging system – charging erratically – 14 to 16+ volts Check electrical connections Check power and ground cables Clear code and test drive Running good until problem occurs again Recommend checking at Chevy Dealer
- Need to repair computer problems first
- Drain radiator, flush engine block, add coolant & pressure test.
- Test temperature – idle 52* driving 45* Check system pressures Low pressure 20 psi, High 170 psi Pressures slightly low at idle Found AC compressor noisy Appears to be better after coolant flush and refill Recommend replacing AC compressor
MICHAEL D. gave our service a 5 star review on 8/28/2021