Help with Diagnostic Trouble Codes
Thread Starter
Drifting
Joined: Jan 2010
Posts: 1,624
Likes: 48
From: Saudi Arabia
Help with Diagnostic Trouble Codes
Pulled the codes today from my '94 and I got those,
C12
H48
H43
H67
H24
DTC #48: Mass Air Flow Sensor Circuit.
DTC #43: Knock Sensor Circuit.
DTC #67: A/C Pressure Sensor Circuit Sensor or A/C Clutch.
DTC #24: Vehicle Speed Sensor Circuit.
what is c12 ?
Does h43,h48 and h67 mean I have to replace the sensors ?
C12
H48
H43
H67
H24
DTC #48: Mass Air Flow Sensor Circuit.
DTC #43: Knock Sensor Circuit.
DTC #67: A/C Pressure Sensor Circuit Sensor or A/C Clutch.
DTC #24: Vehicle Speed Sensor Circuit.
what is c12 ?
Does h43,h48 and h67 mean I have to replace the sensors ?
Thread Starter
Drifting
Joined: Jan 2010
Posts: 1,624
Likes: 48
From: Saudi Arabia
The speedo is not working , although i replaced it with a new one.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
C12 is no distributor reference pulses. That is because the engine is not running. It is frequently listed as "no problems", which isn't accurate, but it is used a delimiter to flag the begin and end of the list of error codes.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Pro
Joined: Aug 2004
Posts: 549
Likes: 13
From: Richmond VA
The ECU is still set for an automatic, reflash it for the manual and speedo will work. Deselect switch table entry automatic transmission is the only change needed. My 94 had same issue after zf6 swap and that is the only change required to get it working.
If the tune bin file you sent was current just use the bin file sent back to you and your speedo should work. The only change was the one switch table entry.
If the tune bin file you sent was current just use the bin file sent back to you and your speedo should work. The only change was the one switch table entry.