P1639 Diagnostic Trouble Code Discussion for July 2005
5-Volt Reference 'B' Circuit Malfunction
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| Help Request | Posted | |
| 2001 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GKFK16751 P1639: 5 volt reference 2 circuit. ... Yukon on June 28 so we could drive it to Virginia on the 30th, decided to flush the cooling system while I had it in, Day before we are sposed ta leave she calls and says check engine light came on while getting on hiway to work. when she gets home I put s... |
July 11, 2005 | |
| 2001 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GKFK16751 P1639: 5 volt reference 2 circuit. ... Yukon on June 28 so we could drive it to Virginia on the 30th, decided to flush the cooling system while I had it in, Day before we are sposed ta leave she calls and says check engine light came on while getting on hiway to work. when she gets home I put s... |
July 13, 2005 |
