Attention: TDR Forum Junkies 
TDRComm
Staff Member
Ram/Cummins 2019-2020 CP4 Injection Pump Saga: Misery Loves Company
Go ahead, do a search on “misery loves company” and you’ll find its meaning, its origin, 67 quotes and sayings, videos, and Bible references. Likely, you’ll be sidetracked for a good 30 minutes, and you’ll start to contemplate your bad day at work.
I digress. Focus. Focus.
On an automotive note, here is a headline from the folks at Automotive News about the infamous Bosch CP4 fuel pump: “NHTSA Upgrades Stellantis Probe Involving Bosch Fuel Pump Failures.”
The 3/21/23 article written by Audrey Laforest tells us that NHTSA is now investigating CP4 injection pump failures in the Jeep diesel-powered vehicles, the Ram 1500 EcoDiesel and BMW diesel-powered cars and SUVs. Yep, misery loves company. Here are some selected passages:
“According to a document made public on 3/21/23, NHTSA’s Office of Defects Investigation is expanding its safety probe to include the Tier 1 supplier Robert Bosch, which makes the CP4 high-pressure fuel injection pumps. The expanded probe also includes any automakers who installed the part and are experiencing similar failures.
“In October 2021, NHTSA launched its investigation of high-pressure fuel pump failures in 2019-20 Ram 2500, 3500, 4500 and 5500 heavy-duty trucks equipped with 6.7-liter Cummins turbodiesel engines after reports alleging incidents of stalling or loss of power. The upgraded probe also covers 2014-22 Ram 1500 trucks.
“In addition to those vehicles, the probe covers Bosch’s C4 fuel pumps in 2021-22 Jeep Gladiator, 2014-20 Jeep Grand Cherokee and 2020-22 Jeep Wrangler vehicles. It also covers older models from BMW, including 2014-18 BMW 328D, 2014-16 BMW 535D and 2015-17 BMW X3 vehicles.
“The upgraded probe—now an engineering analysis—is a required step before NHTSA can seek a recall. An information request letter from BMW ‘indicated that failed pumps on their vehicles were caused by an interaction between pump internal components and U.S. market diesel fuel, leading to increased slip and eventual particle-generating wear surface.’
“The agency now will investigate whether a similar root cause is associated with vehicles previously recalled by Stellantis and if similar wear dynamics occur on pumps supplied to other automakers.”
Again, misery loves company.
I am the owner of a 2020 Ram/Cummins that is a part of the original recall notice that was issued… Wait, when was it issued?
Although I’m certain I’ve received notice(s) from Ram, I’ve yet to rush to the Ram dealer for a repair. My motto: “If it isn’t broke, don’t fix it.” And, likely, there is a failed truck somewhere in the USA that needs the scarce part(s). I’ll wait patiently.
In the meantime, we’ve covered the CP4 saga since the 2019 Cummins 6.7-liter, compacted graphite iron (CGI) engine was introduced.
Chapter and verse for TDR coverage of the Bosch CP4.2 fuel pump used on the CGI engine:
Stay tuned as there are further developments.
RP
Go ahead, do a search on “misery loves company” and you’ll find its meaning, its origin, 67 quotes and sayings, videos, and Bible references. Likely, you’ll be sidetracked for a good 30 minutes, and you’ll start to contemplate your bad day at work.
I digress. Focus. Focus.
On an automotive note, here is a headline from the folks at Automotive News about the infamous Bosch CP4 fuel pump: “NHTSA Upgrades Stellantis Probe Involving Bosch Fuel Pump Failures.”
The 3/21/23 article written by Audrey Laforest tells us that NHTSA is now investigating CP4 injection pump failures in the Jeep diesel-powered vehicles, the Ram 1500 EcoDiesel and BMW diesel-powered cars and SUVs. Yep, misery loves company. Here are some selected passages:
“According to a document made public on 3/21/23, NHTSA’s Office of Defects Investigation is expanding its safety probe to include the Tier 1 supplier Robert Bosch, which makes the CP4 high-pressure fuel injection pumps. The expanded probe also includes any automakers who installed the part and are experiencing similar failures.
“In October 2021, NHTSA launched its investigation of high-pressure fuel pump failures in 2019-20 Ram 2500, 3500, 4500 and 5500 heavy-duty trucks equipped with 6.7-liter Cummins turbodiesel engines after reports alleging incidents of stalling or loss of power. The upgraded probe also covers 2014-22 Ram 1500 trucks.
“In addition to those vehicles, the probe covers Bosch’s C4 fuel pumps in 2021-22 Jeep Gladiator, 2014-20 Jeep Grand Cherokee and 2020-22 Jeep Wrangler vehicles. It also covers older models from BMW, including 2014-18 BMW 328D, 2014-16 BMW 535D and 2015-17 BMW X3 vehicles.
“The upgraded probe—now an engineering analysis—is a required step before NHTSA can seek a recall. An information request letter from BMW ‘indicated that failed pumps on their vehicles were caused by an interaction between pump internal components and U.S. market diesel fuel, leading to increased slip and eventual particle-generating wear surface.’
“The agency now will investigate whether a similar root cause is associated with vehicles previously recalled by Stellantis and if similar wear dynamics occur on pumps supplied to other automakers.”
Again, misery loves company.
I am the owner of a 2020 Ram/Cummins that is a part of the original recall notice that was issued… Wait, when was it issued?
Although I’m certain I’ve received notice(s) from Ram, I’ve yet to rush to the Ram dealer for a repair. My motto: “If it isn’t broke, don’t fix it.” And, likely, there is a failed truck somewhere in the USA that needs the scarce part(s). I’ll wait patiently.
In the meantime, we’ve covered the CP4 saga since the 2019 Cummins 6.7-liter, compacted graphite iron (CGI) engine was introduced.
Chapter and verse for TDR coverage of the Bosch CP4.2 fuel pump used on the CGI engine:
November 2019, Issue 106, pages 110-111: Stan Gozzi gives us a “Technical Analysis of the CP4.2 Injection Pump.”
February 2020, Issue 107, page 57: “A Lawsuit Involving GM (CP4) Diesels.”
May 2021, Issue 112, pages 94-97: Stan Gozzi looks at “CP4.2 Preventive Maintenance.”
February 2022, Issue 115, pages 7-11: Bruce Smith gives us an update on the class action lawsuits against manufacturers that used the Bosch CP4 fuel injection pump, “Bosch CP4 Court Battles Rage On.”
February 2022, Issue 115, pages 12 and 44: “Ram Recall Y78 and TSB 18-054-21” are discussed.
August 2022, Issue 117, pages 98-102: Stan Gozzi gives us a closer look, “Recall Y78 and TSB 18-054-21.”
November 2022, Issue 118, page 10: The “Backfire” column gives the audience “CP4 Longevity Tips.” (A repeat of Issue 112’s tips.)
February 2020, Issue 107, page 57: “A Lawsuit Involving GM (CP4) Diesels.”
May 2021, Issue 112, pages 94-97: Stan Gozzi looks at “CP4.2 Preventive Maintenance.”
February 2022, Issue 115, pages 7-11: Bruce Smith gives us an update on the class action lawsuits against manufacturers that used the Bosch CP4 fuel injection pump, “Bosch CP4 Court Battles Rage On.”
February 2022, Issue 115, pages 12 and 44: “Ram Recall Y78 and TSB 18-054-21” are discussed.
August 2022, Issue 117, pages 98-102: Stan Gozzi gives us a closer look, “Recall Y78 and TSB 18-054-21.”
November 2022, Issue 118, page 10: The “Backfire” column gives the audience “CP4 Longevity Tips.” (A repeat of Issue 112’s tips.)
Stay tuned as there are further developments.
RP
