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Unread 09-11-2012, 11:16 AM   #1
fisher836
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P2173 Code – Lightning Bolt – Rough Idle

Ran a search online for this code that’s being thrown on my 2008 Wrangler Rubicon Unlimited. Saw to check large vacuum hoses, intake etc. and make sure everything is nice and snug. Everything seems to be in order. If I shut the Jeep off and restart it, it runs fine for a while. Could it be a faulty EGR valve? Just looking for ideas. If you find/have better links then I’ve found on yahoo, post em for me. Thanks in advance

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Unread 09-11-2012, 02:14 PM   #2
ronjenx
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P2173-HIGH AIRFLOW/VACUUM LEAK DETECTED (SLOW ACCUMULATION)


When Monitored:
Ignition on and engine running with no MAP Sensor DTCs.

Set Condition:
A large vacuum leak has been detected or both of the TP Sensors have failed based on their position being 2.5 volts and the calculated MAP value is less than the Gas Flow Adaptation value is too high. One trip fault the code will set within 5 seconds. ETC light will flash.


Possible Causes

VACUUM LEAK [see "Vacuum Leak", below Possible Causes list]

RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT

(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT

(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT

RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE TP SENSOR SIGNAL CIRCUIT

TP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (K922) TP RETURN CIRCUIT

MAP SENSOR

TP SENSOR

POWERTRAIN CONTROL MODULE (PCM)


VACUUM LEAK
NOTE: This code is enabled on engines with a plastic intake manifold and is intended to limit the maximum engine speed if a large crack occurs.

NOTE: A large vacuum leak is most likely the cause of this DTC.

Inspect the Intake Manifold and Throttle body for leaks and cracks.
Inspect the Power Brake Booster for any vacuum leaks.
Inspect the PCV system for proper operation or any vacuum leaks.
Inspect the MAP Sensor for proper installation.
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Unread 06-03-2013, 09:14 PM   #3
Jeep Kid
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Ever find the problem to your code? I'm having the exact same issue and having issues finding the source. Checked all vacuum areas with starter fluid and propane multiple times, no luck on my end.
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Unread 06-03-2013, 11:10 PM   #4
RockyClymer
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Check the EGR connection/gasket at the top of the intake plenum. Also, check MAP sensor and make sure O ring is good and that it is locked into position.
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Unread 06-04-2013, 08:18 AM   #5
fisher836
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Yup, ended up being the $13 egr valve. Good place to start especially money-wise
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