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2002 GMC envoy code p0014 camshaft position actuator b bank

Customer Question
1 timming over adv...
2002 GMC envoy code p0014 camshaft position actuator b bank 1 timming over adv ? I had changed variable timing solenoid , cam position sensor , cooling temp ,crankshaft sensor ,oil & oil filter changed , air filter changed . but engine light still came back on after 30 mm ?
Submitted: 6 years ago.Category: Chevy
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Answered in 1 hour by:
6/5/2011
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago
Tim's Auto Repair
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Satisfied Customers: 16,087
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what is the engine size?

4.2?

 

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Customer reply replied 6 years ago
yes
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago
how many miles is on the envoy?
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Customer reply replied 6 years ago
144700
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

ok

does the engine make any noise at all...maybe a little rattle out front when you first start it??

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Customer reply replied 6 years ago
no but the idle move up & come back down to normal
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

ok

i am thinking you problem may be a worn/stretched timing chain,,,this could throw it out enough for the light to come on,,,you may need a new timing set..

thanks

 

 

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P0014

DTC P0014

CIRCUIT DESCRIPTION

  • The cam phasing system is a hydraulically actuated phase shifting mechanism. The powertrain control module (PCM) supplies the ignition positive driver and ground circuits. A pulse width modulated (PWM) driver controls the amount that the camshaft actuator solenoid assembly advances or retards the exhaust camshaft. The exhaust camshaft is commanded to a maximum retard position of 25 degrees . When the exhaust camshaft is retarded at the maximum rate, the duty cycle of the signal is at 100 percent . The maximum advance rate has a 0 percent duty cycle. Other than when the camshaft is at full advance, a 50 percent duty cycle is used to maintain a steady retard angle.
  • If the desired and actual cam phase angle error exceeds its tolerance value for a certain amount of time, then DTC P0014 will set.

CONDITIONS FOR RUNNING THE DTC

  • The engine is running.
  • The PCM has enabled the cam phaser.

CONDITIONS FOR SETTING THE DTC

  • The vehicle must be driven.
  • The difference between the desired CAM phase angle and the actual CAM phase angle is more than 3.5 degrees .
  • The CAM phaser is steady for 12.25 seconds .
  • The condition is present for 12.25 seconds .

ACTION TAKEN WHEN THE DTC SETS

  • The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
  • The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

  • The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
  • A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
  • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
  • Clear the MIL and the DTC with a scan tool.

DIAGNOSTIC AIDS

  • The scan tool cam phase control function increments the cam phaser in 10 percent increments. Each increment equates to 2.5 degrees of cam phasing. A cam phase angle of 15 degrees is achieved by commanding the phaser with the scan tool to 60 percent .
  • Inspect any engine mechanical work that has been performed recently. Verify that the engine timing has not been altered.
  • If this DTC is set along with any crankshaft position (CKP) or camshaft position (CMP) sensor DTCs, then both the CKP and CMP sensor DTCs should be diagnosed prior to performing this diagnostic. The PCM uses both inputs to determine the actual camshaft position.
  • Check the following items:
  • A loose CMP sensor causing a variance in the sensor signal
  • A loose CKP sensor causing a variance in the sensor signal
  • Excessive free play in the timing chain and gear assembly
  • Debris or contamination interfering with the camshaft position actuator solenoid valve assembly
  • Debris or contamination interfering with the camshaft position actuator assembly
  • Engine oil has a major impact upon the camshaft actuation system's responsiveness. Oil temperature, viscosity, and quality can slow and/or inhibit the phaser's ability to reach a desired phase angle.

TEST

Steps 1-8
Steps 9-13
Steps 14-23

 

ALL THE BONUS MONEY THAT I RECEIVE DURING THE MONTH OF JUNE WILL BE DONATED TO THE AMERICAN RED CROSS FOR TORNADO RELEIF IN THE MID WEST AND DEEP SOUTH

Tim's Auto Repair
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Satisfied Customers: 16,087
Experience: Have owned a repair shop for 25 yrs.
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Customer reply replied 6 years ago

i did all information above but won,t help but anyway thank you for your information . Gmc it" suck

Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

yes

this is why i think the chain may be stretched

thanks

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