Check Engine Light" and the "Reduced Engine Light" come on at the same time?

Tiny
KPEGUES
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 85,000 MILES
While driving my vehicle, all of a sudden the "Check Engine Light" and the "Reduced Engine Light" come on at the same time. The vehicle suddenly slows down to about 10 miles per hour. If I turn the car off and wait a minute, it will start right back up and I can drive normally again. What is this?
Saturday, August 15th, 2009 AT 5:14 PM

7 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
The sudden appearance of the "Check Engine Light" and the "Reduced Engine Power" warning, along with a significant loss of speed, is a common issue in many vehicles.
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Sunday, August 16th, 2009 AT 9:33 AM
Tiny
KPEGUES
  • MEMBER
  • 2 POSTS
I noticed another person had the same problem I had with their 2003 Trailblazer - the reduced engine speed light came on while driving and the car speed suddenly dropped to about 10 mph - has there been a recall or problem with this malfunction and trailblazers?
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Sunday, August 16th, 2009 AT 11:06 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
No recall I'm aware of, Some problems are more common with similar components.

Follow that person's thread for potential information.

Did you get the codes yet?
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Sunday, August 16th, 2009 AT 6:53 PM
Tiny
MJ_ORIGINAL
  • MEMBER
  • 8 POSTS
Similar deal: CHK ENGINE, REDUCED POWER
2002 LS 4.2L 2WD AUTO
310,000 MILES, REBUILT 265,000
CODES: P1614, P1345

NEW/RECENT
ALL PLUGS AND COILS
MAP, CRANKCASE AND CAMSHAFT POSITION Sensors
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Sunday, August 20th, 2023 AT 9:24 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Here's what each code indicates:

P1614 - Loss of RIM Serial Data:

P1345 - Crankshaft/Camshaft Position Sensor (CMP/CKP) Correlation:
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Sunday, August 20th, 2023 AT 12:37 PM
Tiny
MJ_ORIGINAL
  • MEMBER
  • 8 POSTS
Thanks for the prompt reply!
I erred that the -1614 is actually
P1514. Your code information seems close to what I've found online, a timing conflict. Is that correct?

The only sensor left to swap out is the VVT solenoid. At 300k+ miles I'd say I've gotten my money's worth; I don't know.
Just to 'pop the lid' on the timing chain cover is considerable.
What next steps would you suggest?
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Sunday, August 20th, 2023 AT 1:26 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Known as the Throttle Body Control Module (TBCM). This code points to an issue with the Throttle Position Actuator Performance.
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Monday, August 21st, 2023 AT 9:28 AM

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