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Thread: C1726 and C1964 DTC's for air suspension

  1. #1
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    C1726 and C1964 DTC's for air suspension

    I tried searching and couldn't find anything on the forums, but my new to me 03 MM has developed an air suspension issue. The rear is lower than normal, no obvious signs of an air leak. The car has sat overnight and the rear has not changed positions. I had the car on jack stands for about a week with the rear end unsupported. After placing back on the ground and turning the air ride switch back to the on position, the compressor runs for 45-60 seconds but the rear never rises. Using Forscan, I ran the self check and pulled codes C1726 and C1964. All I can find for C1726 is a possible air leak or bad compressor. C1964 is basically stating the compressor has cycled too much which makes sense. The car has 100101 miles on it. Has anyone had a similar issue?
    03 Marauder- 300B, non heated seats, T/C, no CD changer
    03 Marauder- 300A, Eaton Swapped, SOLD

    03 Marauder- 300A, 5544 of 7839 in 03, Trilogy #24, SOLD
    04 Marauder- 300B, SB with LF interior, 208k miles and still ticking SOLD

  2. #2
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    Hows the switch on the watts link?


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    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  3. #3
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    Ran for 60 seconds and not raising, id look into seeing if the solenoids are getting power and ground. The compressor is on, the air goes somewhere... does it put out air?
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  4. #4
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    Bob- That was one of my first moves. I adjusted the switch to raise the rear. No effect.

    Bryan- I haven't taken the line loose on the compressor to see if its putting air out. I'll try that next. It's making noise like it normally does. Using Forscan for the self test, I can hear the solenoids click in the rear.
    03 Marauder- 300B, non heated seats, T/C, no CD changer
    03 Marauder- 300A, Eaton Swapped, SOLD

    03 Marauder- 300A, 5544 of 7839 in 03, Trilogy #24, SOLD
    04 Marauder- 300B, SB with LF interior, 208k miles and still ticking SOLD

  5. #5
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    I was just curious if the switch was bent or broken internally causing it to think its at ride height but if you tried to adjust it I guess not.


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    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  6. #6
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    Just and update. Pulled the air line out of the compressor and let it run two cycles. Air came out of the line from the rear which makes me think at least one of the solenoids is opening. The compressor is moving air, but I'm not sure what the output should be. It feels like 15-20 psi or so. I ran it a second time with the air line disconnected and using shop air, I attempted to inflate the rear bags. The first cycle was unsuccessful, the rear did not raise. However the second cycle the rear raised to normal height and turned off the compressor once the height was reached. It's currently holding air with a measurement of 29 1/2" from the ground the wheel arch. I'll measure it in 24 hours to see if there is a change. I'm going to order a new compressor, the bushings on the mounts are shot and the housing is pretty rusty.
    03 Marauder- 300B, non heated seats, T/C, no CD changer
    03 Marauder- 300A, Eaton Swapped, SOLD

    03 Marauder- 300A, 5544 of 7839 in 03, Trilogy #24, SOLD
    04 Marauder- 300B, SB with LF interior, 208k miles and still ticking SOLD

  7. #7
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    Just an update, I ordered a new compressor from Rockauto made by Arnott. That fixed the issue.
    03 Marauder- 300B, non heated seats, T/C, no CD changer
    03 Marauder- 300A, Eaton Swapped, SOLD

    03 Marauder- 300A, 5544 of 7839 in 03, Trilogy #24, SOLD
    04 Marauder- 300B, SB with LF interior, 208k miles and still ticking SOLD

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