Question about 1998 Chevrolet C3500

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What does code p1518 mean on 8.1 liter chevy mean?

2003 motorhome

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SOURCE: 2003 Chevy Tahoe 4X4. Started

Tac(throttle actuator control) module to pcm(powertrain control module) circuit problem.Check wire connection on the electric sensor on gas pedal.Most likely just a bad and or dirty connection.See this often on work trucks.

Posted on Feb 15, 2011

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SOURCE: i have a 2003 chevy

P1518 CHEVROLET - Electronic Throttle Module to PCM Communication

Condition/Concern:
Customers may have a concern of lack of power and engine light on. DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). An improperly torqued TAC module ground may be at fault. The Ground is listed as G104 on TAC module schematic which is incorrectly labeled on SI document ID 855376. The correct ground is G103. The locator for SI states that G103 is located on the left hand side which is incorrect. However, there have been field reports stating that G104 has also corrected this condition. G104 is a horizontal bolt in the rear of the left head and extremely difficult to reach. G104 should also be tightened at the same time.

There have also been field cases where ground G110 on the outer drivers side frame rail caused a P1518 code and an intermittent connection at splice 102 on the intake.

All published SI diagnostics should be followed in addition to following the recommendation listed.
Recommendation/Instructions:

Tighten ground G103 located behind the right cylinder head (passenger side) just below the head and mounted into the block. The ground uses a 13 mm bolt head mounted vertically to the engine block just above the bell housing.

• DTC P1518 sets if the battery voltage is low. If the customer's concern is slow cranking or no crank because battery voltage is low, ignore DTC P1518. Clear any DTCs from memory that may have set from the low battery voltage condition.
• DTC P1518 sets when there is a short to B+ on the TAC module ground circuit. Inspect the fuses for the circuits that are in the TAC module harness--i.e. cruise, brake. An inspection of the fuses may lead you to the circuit that is shorted to the TAC module ground circuit.
• DTC P1518 sets if the TAC module ignition feed circuit is shorted to a B+ supply circuit. The TAC module stays powered-up when the ignition switch is turned OFF. When the ignition switch is turned ON, the TAC module is powered-up before the PCM. DTC P1518 sets because no communication is detected by the TAC module from the PCM. Inspect related circuits for being shorted to a B+ supply circuit.
• Inspect the TAC module power and ground circuits and the TAC module/PCM serial data circuits for intermittent connections.
• Inspect the TAC module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
• When the TAC module detects a problem within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing an individual condition may correct more than 1 DTC. Remember this if you review the stored information in Capture Info.


Conditions for Setting the DTC
• The TAC module detects that the predicted and the actual throttle positions are not within a calibrated range of each other.
• The PCM and the TAC cannot determine the throttle position.
• Both of the TP sensors are invalid.
• All of the above conditions are met for more than 1 second.



Condition/Concern:
A vehicle may be brought into the dealer for a reduced power message, and DTCs P0120, P0220, P1516, P2101, or P2135.

The Throttle Actuator Control (TAC) / throttle body type trouble codes, may be caused by a loose wiring crimp at the throttle body connector, or a broken throttle body circuit.

Recommendation/Instructions:
Complete the current SI diagnostics for any symptoms or trouble codes found. If a intermittent T/P or TAC module type code is occurring complete the inspections below.

Inspect all related throttle body terminals for a loose wiring crimp. The loose crimp may be difficult to find, and the poor connection will be between the terminal and the copper strands of the wire. Wiggle test the individual throttle body circuits to see if the concern can be duplicated.
Inspect the related circuits for broken wires inside the insulation. The outer wire insulation may look fine, but the internal copper strands may be partially broken. Breaks in the wires usually occur within 1 to 4 inches of the throttle body connector. Wiggle testing may also induce a trouble code to set.
On C/K trucks complete SI procedures for voltage drop on grounds G103 and G104. Grounds G103 or G104 may be loose or corroded.

If a terminal crimp or a broken wire has been found, repair or replace only the circuits involved.

Keep us updated.

Posted on Apr 05, 2011

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1 Answer

P1518 engine code


P1518 Intake Manifold Runner Control Stuck Open (Bank 1)
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its your intake manifold runner. its a silver box. they all go bad. ether a corroded chip bord or the bar falls off that controls it. If you hear a rattle sound coming from the dash its a barr that fell off if no sound then corrosion. ford wants 600 to fix this but you can do it yourself without bying a new one. ill try to post a link.

http://passionford.com/forum/ford-focus-st/400597-st170-fault-code-p1518.html

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I have a 2004 chevy trailblazer that gave me code p1518


P1518 CHEVROLET Description The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. The TAC module continuously test the integrity of this data. When the TAC module is unable to write or read data to and from random access memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Detected Trouble Code (DTC) is set.
Read more: http://engine-codes.com/p1518_chevrolet.html#ixzz21VOQMCZz

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2003 Chevy Tahoe 4X4. Started driving and vehicle would not accelerate above 40 MPH. Attached a computer diagnostic to it and it gave a code of P1518.


Tac(throttle actuator control) module to pcm(powertrain control module) circuit problem.Check wire connection on the electric sensor on gas pedal.Most likely just a bad and or dirty connection.See this often on work trucks.

Feb 15, 2011 | Chevrolet Tahoe Cars & Trucks

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I need the reason for the ecu error codes for a 2001 firebird 3.8L code #01 P0601,#02 P0606,#3 P1518


P0601 means your engine computer has an internal error; P0606 means that the engine computer has stored in memory exactly the running condition( much like a "black box") that the vehicle was in when the P0606 was triggered. P1518 also relates to the PCM in the matter of low voltage.

Try testing the battery as improper voltage can cause all of these codes. Otherwise it means that your PCM has failed and either needs to be reprogrammed or replaced.

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My 98 taurus has this codes what do i need to fix? p1518.p0174.p0


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1999 ford windstar code P1518


This code means the intake manifold runner is stuck open either from a faulty actuator on the intake or the valves plates are gunked up unable to move,

Jun 17, 2010 | 1999 Ford Windstar

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2003 1500hd chevy silverado 6.0 liter. I had a



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