P0128 Diagnostic Trouble Code Discussion for June 2007
Thermostat System Malfunction
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| Help Request | Posted | |
| 2005 Jeep Grand Cherokee Laredo 3.7L MIL Lamp on VIN: 1J4GR48K65 P0128: Thermostat Rationality. scan freeze frame and found code po128 set after engine ran 641, i beleive this is IN seconds so about (10 minutes), it was running at 1336 rpm at 68 mph ambient temp was c 22 degrees , intake air temp was c 21 degrees and the coolant temp was c 49 degrees whi... |
June 26, 2007 |
