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Codes c1805,c1991,c1998 - 2004 Lincoln LS V8

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On a 2004 Lincoln Navigator the check air suspension light came on. there are no leaks on the lines but the car bounces on the smallest of bumps. Is there a relay or something that has gone bad?


There is a relay an there is a control module that controls everything in the air suspension system an ride height sensors an related wiring ! The control module can have diagnostic trouble codes stored in it's memory as to what the problem could be ! Here are some of the basics to check !
Inspection and Verification
  1. Verify the customer concern.
  1. NOTE: If the door ajar indicator is illuminated when all doors, liftgate, and liftgate glass are closed, the air suspension will not work correctly. Repair door ajar indicator; refer to Section 413-01 . Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Restricted suspension movement
  • Excessive vehicle load
  • Cut, severed, crimped air line(s)
  • Unmounted height sensor(s)
  • Damaged front air spring(s)
  • Damaged rear air spring(s)
  • Central junction box (CJB) fuses 11 (10) (later built vehicles), 20 (30A), fuse 27 (5A), and fuse 111 (50A)
  • Loose, corroded, or disconnected connectors
  • Air suspension service switch is in the OFF position
  • Damaged solenoid valve(s)/height sensor(s)
  1. If the inspection reveals an obvious concern that can be readily repaired, correct the concern before continuing with Inspection and Verification.
  1. NOTE: The 4WAS module is also referred to as the Vehicle Dynamic Module (VDM). If the concern remains after the inspection, use the scan tool connected to the data link connector (DLC) to retrieve continuous diagnostic trouble codes (DTCs) and to execute On-Demand Self Test diagnostics for the 4WAS module.
    • If the On-Demand Self Test is passed and no DTCs are retrieved, GO to Symptom Chart to continue diagnostics.
    • If DTCs are retrieved, go to the 4WAS Module Diagnostic Trouble Code (DTC) Index in this section.
    • If the 4WAS module cannot be accessed by the scan tool, Go To Pinpoint Test A .
Wheel Air Suspension (4WAS) Module Diagnostic Trouble Code (DTC) Index NOTE: Repair all other DTCs before C1725 and C1726. Repair DTCs C1990 and C1991 last. DTCs Description Source Action B1317 Battery voltage high 4WAS module Go To Pinpoint Test C . B1318 Battery voltage low 4WAS module Go To Pinpoint Test C . B1342 ECU is defective 4WAS module INSTALL a new 4WAS module. REFER to Air Suspension Control Module . SET the ride height. REFER to Ride Height Adjustments . CARRY OUT the pneumatic test. TEST the system for normal operation. B1566 Door circuit failure 4WAS module REFER to the Symptom Chart. B2477 VAPS II steering assist curve not complete 4WAS module REFER to Section 211-00 . C1445 Vehicle speed signal circuit failure 4WAS module GO to Symptom Chart . C1724 Air suspension height sensor power circuit failure 4WAS module Go To Pinpoint Test D . C1725 Air suspension front pneumatic failure 4WAS module Go To Pinpoint Test E . C1726 Air suspension rear pneumatic failure 4WAS module Go To Pinpoint Test E . C1760 Air suspension rear height sensor signal circuit failure 4WAS module Go To Pinpoint Test F . C1770 Air suspension vent solenoid output circuit failure 4WAS module Go To Pinpoint Test G . C1790 Air suspension LR air spring/shock solenoid output circuit failure 4WAS module Go To Pinpoint Test H . C1795 Air suspension RR air spring/shock solenoid output circuit failure 4WAS module Go To Pinpoint Test H . C1830 Air suspension compressor relay circuit failure 4WAS module Go To Pinpoint Test I . C1840 Air suspension disable switch circuit failure 4WAS module Go To Pinpoint Test J . C1873 Air suspension RF air spring solenoid output circuit failure 4WAS module Go To Pinpoint Test H . C1877 Air suspension LF air spring solenoid output circuit failure 4WAS module Go To Pinpoint Test H . C1881 Air suspension RF height sensor circuit failure 4WAS module Go To Pinpoint Test F . C1889 Air suspension LF height sensor circuit failure 4WAS module Go To Pinpoint Test F . C1897 Steering VAPS circuit loop failure 4WAS module REFER to Section 211-00 . U1950 UBP communication bus fault 4WAS module REFER to Section 418-00 . C1964 Air suspension compressor actual run time exceeded allowed run time 4WAS module Allow the air compressor to cool down. CLEAR the DTC. REPEAT the self-test. C1990 New control module initialization (requires ride height calibration and pneumatic test pass) 4WAS module REFER to "Clearing DTC C1990 or C1991". C1991 Plant ride height setting and/or tests incomplete 4WAS module REFER to "Clearing DTC C1990 or C1991". U2235 4x4 mode status invalid 4x4 control module REFER to Section 418-00 . U2306 Transmission PRNDL indicator or vehicle speed signal invalid Instrument Cluster (IC) REFER to Section 418-00 . This is a very complex system ,you need a factory scan tool or one that is equal to it ! It could be a fuse a wiring issue a sensor or the module , relay etc... You may want to take this to a ASE repair facility or the dealer !

Aug 05, 2015 | 2004 Lincoln Navigator Luxury

1 Answer

What is code c1805 and code u1262 and code b2900


Search Results

    C1805 - Engine-Codes.com

    engine-codes.com/c1805.html
    Possible Causes and Repair Information for C1805 code. Learn what does C1805means? C1805 Mismatched PCM and/or ABS-TC Mod.

Aug 03, 2015 | Cars & Trucks

1 Answer

How do you get C1998 code gone?


This one has to be cleared with a scanner. A code reader won' clear an ABS code.

Dec 02, 2014 | 2004 Ford Expedition

1 Answer

How do fix C1998 code on 04 expedition abs


anytime you open a brake system you should bleed the back furtherst away first then the work forward , easy

Dec 02, 2014 | 2004 Ford Expedition

1 Answer

What does the code c1805 mean


Have you changed anything recently? This is related to the ABS module and PCM mismatching. Have you replaced a tire recently or rims or brakes? If you have different sized tires on the front than you do on the rear it will throw this code, causing the ABS light to come on

May 02, 2014 | 2001 Lincoln LS

1 Answer

2003 lincoln ls advance-trac light flashing


Go to Advance Auto and get them to put their code reader on it. Their readers not only tell a person the code, but suggest what to check as well. If you like, you can snap pictures of the suggested trouble shooting.

Apr 05, 2014 | 2003 Lincoln LS

1 Answer

2004 LINCOLN LS TRACTION CONTROL LIGHT FLASHING & ABS LIGHT ON & BRAKE LIGHT ON. DTC CODES B1342, C1730, C1998.


first check brake fluid level then you will have to test the wheel speed sensors that the codes refer to. when there is a sensor problem it will activate both the abs and traction control lights. the red brake light comes on when there is low fluid condition(leak),worn brakes that need servicing. also if there is a abs module problem it can set codes. you need to know what the codes mean this is a starting place to diagnoise.

Mar 06, 2014 | 2002 Lincoln LS

1 Answer

OBDII codes c1805, I1262, C1963 and P1246 on my 2002 Lincoln LS 3.9L the car seems to run fine. Not sure what I need to do. Any help is greatly appreciated. Thanks in advance, MDB


these codes are strange. the p1246 is alternator load input. try resetting and erase all codes. you can do this with your obd2 or disconnect battery for 10 minutes and reconnect. run car and see if codes reappear. alternator output should be 13-15 volts running.

Oct 24, 2013 | Lincoln Cars & Trucks

4 Answers

My 2002 Lincoln LS v6 Lost Engine Power,Traction Control Light was flashing & ABS light Came on! ANY IDEA?


Had the same problem with my 2002 Lincoln LS, it was a bad wheel speed sensor. The right front wheel bearing had some play in it, so I had the hub assembly replaced. The hub assembly comes with a new wheel speed sensor attached. After I replaced the hub assmbly with sensor, the ABS and Traction Control lights went off. No problem since!

Jun 13, 2011 | 2002 Lincoln LS

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