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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

 
 
 
 
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Old 09-27-2009, 01:15 PM   #1
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Default P1646

P1646

Description
BOOST CONTROL SOLENOID CONTROL CIRCUIT

Output Driver Modules (ODM) are used by PCM to turn on
current-driven devices needed to control various engine and transaxle
functions. Each ODM can control up to 7 outputs, including boost
control solenoid, by supplying ground to device PCM is commanding on.
ODMs can diagnose each circuit individually. If ODM "A" output 5
(boost control solenoid driver circuit) detects an improper voltage
level, DTC is set.

Symptoms
You likely won't notice any drivability problems.

Causes

  • An improper voltage level has been detected on boost control
    solenoid driver circuit.

Solutions
  • Check for faulty connections or damaged harness at BCS
  • Replace boost control solenoid.
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